SwingSearchBar: remove todo about URL for icons

Maybe I'll regret it later. But using String is working fine. The
expectation is that people will ship icons with their plugins. If they
were to use a remote URL instead, it would just make the search UI
depend on the Internet gratuitously, which I'd rather not encourage.

Author: ctrueden

src/main/java/org/scijava/ui/swing/search/SwingSearchBar.java

@@ -671,7 +671,6 @@ private void rebuild() {
 		}
 
 		private Component icon(final String iconPath) {
-			// TODO make icon() return URL, not String.
 			if (iconPath == null || iconPath.isEmpty()) return emptyIcon();
 			final URL iconURL = getClass().getResource(iconPath);
 			if (iconURL == null) return emptyIcon();