build: Bring SVGO optimization to build step

Enabling SVGO automation with 'grunt-svgmin' and conservative
plugin settings to build step, among those:
- enable removeRasterImages and sortAttrs,
- disable cleanupIDs, removeDesc, removeTitle, removeViewBox &
  removeXMLProcInst and
- make use of pretty, indent and multipass options.

Also updating SVG accordingly.

Bug: T185596
Change-Id: I0030a711a2947ca8c1eb4e56d8540661c72a2639

resources/images/compact-links-trigger.svg

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24">
-	<path fill="#72777d" d="M13 19l.8-3h5.3l.9 3h2.2l-4.2-13h-3l-4.2 13h2.2zm3.5-11l2 6h-4l2-6zM5 4l.938 1.906h-4.938v2.094h1.594c.6 1.8 1.406 3.206 2.406 4.406-1.1.7-4.313 1.781-4.313 1.781l1.313 1.813s3.487-1.387 4.688-2.188c1 .7 2.319 1.188 3.719 1.688l.594-2c-1-.3-1.988-.688-2.688-1.188 1.1-1.1 1.9-2.506 2.5-4.406h2.188l.5-2h-5.563l-.938-1.906h-2zm-.188 4h3.781c-.4 1.3-.906 2-1.906 3-1.1-1-1.475-1.7-1.875-3z"/>
+	<path fill="#72777d" d="M13 19l.8-3h5.3l.9 3h2.2L18 6h-3l-4.2 13H13zm3.5-11l2 6h-4l2-6zM5 4l.938 1.906H1V8h1.594C3.194 9.8 4 11.206 5 12.406c-1.1.7-4.313 1.781-4.313 1.781L2 16s3.487-1.387 4.688-2.188c1 .7 2.319 1.188 3.719 1.688l.594-2c-1-.3-1.988-.688-2.688-1.188 1.1-1.1 1.9-2.506 2.5-4.406h2.188l.5-2H7.938L7 4H5zm-.188 4h3.781c-.4 1.3-.906 2-1.906 3-1.1-1-1.475-1.7-1.875-3z"/>
 </svg>