icons: Clean up terminal.svg

Remove metadata and clean up the SVG tags to make it simpler.

src/default-theme/icons/md/terminal.svg

@@ -1,7 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Adobe Illustrator 19.2.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
-<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 24 24" style="enable-background:new 0 0 24 24;" xml:space="preserve">
-<path d="M5,3C3.9,3,3,3.9,3,5v14c0,1.1,0.9,2,2,2h14c1.1,0,2-0.9,2-2V5c0-1.1-0.9-2-2-2H5z M7.4,5.7l4.6,4.6l-4.6,4.6L6,13.5
-	l3.2-3.2L6,7.1 M18.2,18.3H5.8v-1.9h12.3v1.9H18.2z"/>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24">
+    <path d="M5,3C3.9,3,3,3.9,3,5v14c0,1.1,0.9,2,2,2h14c1.1,0,2-0.9,2-2V5c0-1.1-0.9-2-2-2H5z M7.4,5.7l4.6,4.6l-4.6,4.6L6,13.5
+        l3.2-3.2L6,7.1 M18.2,18.3H5.8v-1.9h12.3v1.9H18.2z"/>
 </svg>