ScriptService: fix bug in getOrCreate

Without this change, the cache missed every time, due to the wrong
key (a File rather than a String path) being used for the lookup.

Thanks Eclipse for the warning.

Author: ctrueden

src/main/java/org/scijava/script/DefaultScriptService.java

@@ -353,7 +353,7 @@ private synchronized void initAliasMap() {
 	 * are registered with the service.
 	 */
 	private ScriptInfo getOrCreate(final File file) {
-		final ScriptInfo info = scripts().get(file);
+		final ScriptInfo info = scripts().get(file.getAbsolutePath());
 		if (info != null) return info;
 		return new ScriptInfo(getContext(), file);
 	}