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/remove-input.svg

@@ -1,5 +1,5 @@
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+	<path stroke="#222" stroke-width="1.2" d="M2.719 15.279L17.28.72"/>
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