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/components/keyring.js

@@ -176,21 +176,21 @@ class KeyringDialog extends ModalDialog.ModalDialog {
         return false;
     }
 
-    _onShowPassword(prompt) {
+    _onShowPassword() {
         this._buildControlTable();
         this._ensureOpen();
         this._updateSensitivity(true);
         this._passwordEntry.grab_key_focus();
     }
 
-    _onShowConfirm(prompt) {
+    _onShowConfirm() {
         this._buildControlTable();
         this._ensureOpen();
         this._updateSensitivity(true);
         this._continueButton.grab_key_focus();
     }
 
-    _onHidePrompt(prompt) {
+    _onHidePrompt() {
         this.close();
     }