Don't set bang config property for :style, :dialog, :quitall which don't support it.

common/content/dactyl.js

@@ -1765,7 +1765,6 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
                 }
             }, {
                 argCount: "1",
-                bang: true,
                 completer: function (context) {
                     context.ignoreCase = true;
                     completion.dialog(context);

common/content/tabs.js

@@ -749,10 +749,7 @@ var Tabs = Module("tabs", {
             commands.add(["quita[ll]", "qa[ll]"],
                 "Quit this " + config.appName + " window",
                 function (args) { window.close(); },
-                {
-                    argCount: "0",
-                    bang: true
-                });
+                { argCount: "0" });
 
             commands.add(["reloada[ll]"],
                 "Reload all tab pages",

common/modules/styles.jsm

@@ -572,7 +572,6 @@ var Styles = Module("Styles", {
                 }
             },
             {
-                bang: true,
                 completer: function (context, args) {
                     let compl = [];
                     let sheet = args["-group"].get(args["-name"]);