cleanup: Define GObject accessors in camelCase

gjs is smart enough to match a propertyName getter/setter to the
corresponding property-name GObject property, so use that and get
rid of the eslint camelcase rule exceptions.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1611>

js/misc/modemManager.js

@@ -117,13 +117,11 @@ var ModemBase = GObject.registerClass({
         this._signalQuality = 0;
     }
 
-    // eslint-disable-next-line camelcase
-    get operator_name() {
+    get operatorName() {
         return this._operatorName;
     }
 
-    // eslint-disable-next-line camelcase
-    get signal_quality() {
+    get signalQuality() {
         return this._signalQuality;
     }