cleanup: Remove empty leading/trailing lines in blocks

gjs added a new rule to its eslint ruleset that forbids "block padding",
so make sure we conform to that rule before syncing up the configuration.

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1498

js/misc/jsParse.js

@@ -201,7 +201,6 @@ function removeLiterals(str) {
 // Returns true if there is reason to think that eval(str)
 // will modify the global scope
 function isUnsafeExpression(str) {
-
     // Check for any sort of assignment
     // The strategy used is dumb: remove any quotes
     // or regexs and comparison operators and see if there is an '=' character.