Bug 1865468 - Fix TrackPoint::IsDriverInstalled. r=masayuki

Let me know if this is unused for some reason and we can remove or what
not.

Differential Revision: https://phabricator.services.mozilla.com/D193983

widget/windows/WinMouseScrollHandler.cpp

@@ -1407,7 +1407,7 @@ bool MouseScrollHandler::Device::TrackPoint::IsDriverInstalled() {
     MOZ_LOG(gMouseScrollLog, LogLevel::Info,
             ("MouseScroll::Device::TrackPoint::IsDriverInstalled(): "
              "Alps's TrackPoint driver is found"));
-    // FIXME(emilio): Missing return true here??
+    return true;
   }
 
   return false;