Java: Inline expectation should have space after $

This was a regex-find-replace from `// \$(?! )` (using a negative lookahead) to `// $ `.

java/ql/test/query-tests/security/CWE-749/UnsafeActivity2.java

@@ -31,6 +31,6 @@ public class UnsafeActivity2 extends Activity {
 		});
 
 		String thisUrl = getIntent().getExtras().getString("url");
-		wv.loadUrl(thisUrl); // $hasUnsafeAndroidAccess
+		wv.loadUrl(thisUrl); // $ hasUnsafeAndroidAccess
 	}
 }