[FIX] web: copy traceback in firefox

Same issue as in 902e484. In some browser (eg. firefox) the container
parameter of ClipboardJS is needed if the focus is inside the modal so
the copy work.

See information on:
zenorocha/clipboard.js#368

opw-1902040
closes odoo#28117

addons/web/static/src/js/services/crash_manager.js

@@ -130,7 +130,11 @@ var CrashManager = core.Class.extend({
             clipboard = new window.ClipboardJS($clipboardBtn[0], {
                 text: function () {
                     return (_t("Error") + ":\n" + error.message + "\n\n" + error.data.debug).trim();
-                }
+                },
+                // Container added because of Bootstrap modal that give the focus to another element.
+                // We need to give to correct focus to ClipboardJS (see in ClipboardJS doc)
+                // https://github.com/zenorocha/clipboard.js/issues/155
+                container: dialog.el,
             });
             clipboard.on("success", function (e) {
                 _.defer(function () {