Updates utils-x11: e91ef75 Flatpatk install command for firefox

diff --git a/utils-x11 b/utils-x11
index a94cf13a1444dc679ec264219fe297650603cc27..e91ef750dfec62c97928f643fc10ad8a2daf8bc4 160000 (submodule)
--- a/utils-x11
+++ b/utils-x11
@@ -1 +1 @@
-Subproject commit a94cf13a1444dc679ec264219fe297650603cc27
+Subproject commit e91ef750dfec62c97928f643fc10ad8a2daf8bc4