Bug 1737050: Update Site icon for about:profiling page to the Profiler Icon r=julienw

Differential Revision: https://phabricator.services.mozilla.com/D173557

devtools/client/performance-new/aboutprofiling/index.xhtml

@@ -6,7 +6,7 @@
     <meta http-equiv="Content-Security-Policy"
       content="default-src 'none'; style-src chrome: resource:; img-src chrome: resource:; script-src chrome: resource:; object-src 'none'" />
     <meta name="color-scheme" content="light dark" />
-    <link rel="icon" type="image/png" href="chrome://devtools/skin/images/profiler-stopwatch.svg" />
+    <link rel="icon" type="image/svg+xml" href="chrome://devtools/skin/images/tool-profiler.svg" />
     <link rel="stylesheet" href="chrome://global/skin/global.css" type="text/css"/>
     <link rel="stylesheet" href="chrome://global/skin/in-content/common.css" type="text/css"/>
     <link rel="stylesheet" href="chrome://devtools/skin/aboutprofiling.css" type="text/css"/>