cleanup: Remove some unhelpful unused arguments

Those unused arguments aren't bugs - unbeknownst to eslint, they all
correspond to valid signal parameters - but they don't contribute
anything to clarity, so just remove them anyway.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/627

js/ui/viewSelector.js

@@ -512,7 +512,7 @@ var ViewSelector = class {
         return this._text.text == this._entry.get_text();
     }
 
-    _onTextChanged(se, prop) {
+    _onTextChanged() {
         let terms = getTermsForSearchString(this._entry.get_text());
 
         this._searchActive = (terms.length > 0);