icons: s/gimp-tool-blend/gimp-tool-gradient/ in SVG icons

In particular, so that we use the correct element IDs, if we ever
extract the icons based on element ID.

icons/Color/24/gimp-tool-gradient.svg

@@ -16,7 +16,7 @@
    id="svg30571"
    version="1.1"
    inkscape:version="0.91+devel r"
-   sodipodi:docname="gimp-tool-blend-24.svg"
+   sodipodi:docname="gimp-tool-gradient-24.svg"
    inkscape:export-filename="/home/klaus/Bilder/icons/Symbolic/hicolor/24x24/apps/gimp-channel.png"
    inkscape:export-xdpi="98.181816"
    inkscape:export-ydpi="98.181816">

icons/Color/color-scalable.svg

@@ -34971,7 +34971,7 @@
          id="tspan6485-0-0-7-1-3-8-2-2">24px</tspan></text>
     <g
        transform="matrix(0.99801113,0,0,1.0000424,-202.65861,-901.6095)"
-       id="gimp-tool-blend-24">
+       id="gimp-tool-gradient-24">
       <rect
          y="1028.8623"
          x="0.50006986"
@@ -35009,7 +35009,7 @@
     </g>
     <g
        transform="matrix(0.99805189,0,0,0.99805286,-360.14003,-899.54753)"
-       id="gimp-tool-blend">
+       id="gimp-tool-gradient">
       <rect
          y="1037.7817"
          x="0.36080682"

icons/Color/scalable/gimp-tool-gradient.svg

@@ -16,7 +16,7 @@
    id="svg30571"
    version="1.1"
    inkscape:version="0.91+devel r"
-   sodipodi:docname="gimp-tool-blend.svg"
+   sodipodi:docname="gimp-tool-gradient.svg"
    inkscape:export-filename="/home/klaus/Bilder/icons/Symbolic/hicolor/24x24/apps/gimp-channel.png"
    inkscape:export-xdpi="98.181816"
    inkscape:export-ydpi="98.181816">

icons/Symbolic/24/gimp-tool-gradient.svg

@@ -13,8 +13,8 @@
    id="svg30571"
    version="1.1"
    inkscape:version="0.91+devel r"
-   sodipodi:docname="gimp-tool-blend-24.svg"
-   inkscape:export-filename="/home/klaus/Bilder/icons/gimp-icons/gimp-tool-blend.png"
+   sodipodi:docname="gimp-tool-gradient-24.svg"
+   inkscape:export-filename="/home/klaus/Bilder/icons/gimp-icons/gimp-tool-gradient.png"
    inkscape:export-xdpi="90"
    inkscape:export-ydpi="90">
   <defs

icons/Symbolic/scalable/gimp-tool-gradient.svg

@@ -15,7 +15,7 @@
    width="16.000002"
    version="1.1"
    inkscape:version="0.91 r13725"
-   sodipodi:docname="gimp-tool-blend.svg">
+   sodipodi:docname="gimp-tool-gradient.svg">
   <sodipodi:namedview
      pagecolor="#ffffff"
      bordercolor="#666666"
@@ -211,7 +211,7 @@
      style="display:inline"
      id="tools">
     <g
-       id="gimp-tool-blend"
+       id="gimp-tool-gradient"
        transform="translate(9.6501258,-722.98286)">
       <rect
          style="opacity:1;fill:#bebebe;fill-opacity:0.12455325;stroke:none"

icons/Symbolic/symbolic-scalable.svg

@@ -21413,7 +21413,7 @@
     </g>
     <g
        transform="translate(-175.02969,-688.16918)"
-       id="gimp-tool-blend">
+       id="gimp-tool-gradient">
       <rect
          y="1047.3622"
          x="1"
@@ -30285,7 +30285,7 @@
        id="gimp-gradient-linear"
        inkscape:label="gimp-gradient-linear">
       <g
-         inkscape:label="gimp-tool-blend"
+         inkscape:label="gimp-tool-gradient"
          id="g1279"
          style="display:inline"
          transform="translate(20,302)">
@@ -34833,7 +34833,7 @@
     </g>
     <g
        transform="translate(-202.98582,-915.72392)"
-       id="gimp-tool-blend-24"
+       id="gimp-tool-gradient-24"
        style="fill:url(#linearGradient23348);fill-opacity:1">
       <path
          sodipodi:nodetypes="sccccsccccccccccccccccccssccccccccccccccccccccccccccccccccccccccccccccccccccccccc"