Add code icon for snippets

I made this icon myself long ago, so no IP issues.

Author: ctrueden

src/main/java/org/scijava/search/snippet/SnippetSearchResult.java

@@ -83,8 +83,7 @@ public String identifier() {
 
 	@Override
 	public String iconPath() {
-		return null;
-//		return "/icons/" + language.getNames().get(0);
+		return "/icons/search/code.png";
 	}
 
 	@Override