Improve the SoftBody node editor icon

The new icon uses 2-pixel-thick lines for consistency with other icons.
Its pixels are also aligned to the 16 pixel grid.

editor/icons/icon_soft_body.svg

@@ -1,56 +1 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg height="16" viewBox="0 0 16 16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m2 1s-3 5 0 7-1 7-1 7h13s3-6 0-8 1-6 1-6zm2 2h7s-2 3 1 5 0 5 0 5h-7s2-4-1-6 0-4 0-4z" fill="#fc9c9c" fill-opacity=".996078"/></svg>
-<svg
-   xmlns:dc="http://purl.org/dc/elements/1.1/"
-   xmlns:cc="http://creativecommons.org/ns#"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   width="16"
-   height="16"
-   version="1.1"
-   viewBox="0 0 16 16"
-   id="svg2"
-   inkscape:version="0.91 r13725"
-   sodipodi:docname="icon_soft_body.svg">
-  <metadata
-     id="metadata14">
-    <rdf:RDF>
-      <cc:Work
-         rdf:about="">
-        <dc:format>image/svg+xml</dc:format>
-        <dc:type
-           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-      </cc:Work>
-    </rdf:RDF>
-  </metadata>
-  <defs
-     id="defs12" />
-  <sodipodi:namedview
-     pagecolor="#ffffff"
-     bordercolor="#666666"
-     borderopacity="1"
-     objecttolerance="10"
-     gridtolerance="10"
-     guidetolerance="10"
-     inkscape:pageopacity="0"
-     inkscape:pageshadow="2"
-     inkscape:window-width="1920"
-     inkscape:window-height="1027"
-     id="namedview10"
-     showgrid="false"
-     inkscape:zoom="18.792233"
-     inkscape:cx="2.8961304"
-     inkscape:cy="4.3816933"
-     inkscape:window-x="-8"
-     inkscape:window-y="-8"
-     inkscape:window-maximized="1"
-     inkscape:current-layer="svg2" />
-  <path
-     style="opacity:1;fill:#fc9c9c;fill-opacity:0.99607843;fill-rule:nonzero;stroke:none;stroke-width:1.42799997;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
-     d="m 2.3447105,1.6091897 c -0.011911,1.9816766 -1.4168958,3.9344766 0,5.9495986 1.4168957,2.0151221 0,6.6693597 0,6.6693597 l 10.9510055,0 c 0,0 1.780829,-4.4523824 0,-6.489075 -1.780829,-2.0366925 -0.183458,-4.119112 0,-6.1298833 z m 1.8894067,0.7549031 7.4390658,0 c -0.431995,1.5996085 -1.62289,4.0426807 0,5.3749802 1.622888,1.3322996 0,5.887932 0,5.887932 l -7.4390658,0 c 0,0 1.3903413,-4.3680495 0,-5.9780743 -1.3903412,-1.6100247 -0.3951213,-3.7149271 0,-5.2848379 z"
-     id="rect4142"
-     inkscape:connector-curvature="0"
-     sodipodi:nodetypes="czcczcccczcczc" />
-</svg>