cleanup: Avoid unnecessary parentheses

Extra parentheses usually add noise rather than clarity, so avoid
them.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/805

js/misc/jsParse.js

@@ -79,7 +79,7 @@ function findMatchingSlash(expr, offset) {
 // findMatchingBrace("[(])", 3) returns 1.
 function findMatchingBrace(expr, offset) {
     let closeBrace = expr.charAt(offset);
-    let openBrace = ({ ')': '(', ']': '[' })[closeBrace];
+    let openBrace = { ')': '(', ']': '[' }[closeBrace];
 
     return findTheBrace(expr, offset - 1, openBrace, closeBrace);
 }