Make uses of AddressPickerDialog static dialogs

Fixes https://github.com/vector-im/riot-web/issues/10603

Static dialogs are ones that stay open underneath other dialogs, like the terms of service prompt. This is how user/room settings operate.

src/GroupAddressPicker.js

@@ -46,7 +46,7 @@ export function showGroupInviteDialog(groupId) {
 
                 _onGroupInviteFinished(groupId, addrs).then(resolve, reject);
             },
-        });
+        }, /*className=*/null, /*isPriority=*/false, /*isStatic=*/true);
     });
 }
 
@@ -81,7 +81,7 @@ export function showGroupAddRoomDialog(groupId) {
 
                 _onGroupAddRoomFinished(groupId, addrs, addRoomsPublicly).then(resolve, reject);
             },
-        });
+        }, /*className=*/null, /*isPriority=*/false, /*isStatic=*/true);
     });
 }