icons: Fix arrow stem to be perfectly 45 degrees

Following-up to further optimize icon SVG and provide arrow stem in
perfect 45 degrees angle.

Bug: T261391
Change-Id: I1fa7789182f0fffb7891205a9099884402d37b61

resources/common/images/link-external-small-ltr-progressive.svg

@@ -3,5 +3,5 @@
 	<title>
 		external link
 	</title>
-	<path fill="#36c" fill-rule="evenodd" d="M11 1H6l2 2 .3.3-4 4 .6.7 4-4H9l2 2V1ZM2 2h2v1H2v7h7V8h1v2a1 1 0 0 1-1 1H2a1 1 0 0 1-1-1V3a1 1 0 0 1 1-1Z" clip-rule="evenodd"/>
+	<path fill="#36c" d="M6 1h5v5L8.86 3.85 4.7 8 4 7.3l4.15-4.16L6 1Z M2 3h2v1H2v6h6V8h1v2a1 1 0 0 1-1 1H2a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1Z"/>
 </svg>

resources/common/images/link-external-small-rtl-progressive.svg

@@ -3,5 +3,5 @@
 	<title>
 		external link
 	</title>
-	<path fill="#36c" fill-rule="evenodd" d="M1 1h5L4 3l-.3.3 4 4-.6.7-4-4H3L1 6V1Zm9 1H8v1h2v7H3V8H2v2a1 1 0 0 0 1 1h7a1 1 0 0 0 1-1V3a1 1 0 0 0-1-1Z" clip-rule="evenodd"/>
+	<path fill="#36c" d="M6 1H1v5l2.14-2.15L7.3 8l.7-.7-4.15-4.17L6 1Z M10 3H8v1h2v6H4V8H3v2a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1V4a1 1 0 0 0-1-1Z"/>
 </svg>