Avoid login shell in install X session

home/stormux/.local/bin/stormux_launch_helpers.sh

@@ -44,7 +44,7 @@ run_install_session_command() {
     fi
 
     export DISPLAY="${DISPLAY:-:0}"
-    /bin/bash -lc "$installCommand"
+    /bin/bash -c "$installCommand"
 }
 
 check_architecture() {