add multiple fix instances check

bin/periodic/fix-flatpaks-theming

@@ -1,4 +1,5 @@
 #!/bin/sh
+pidof -sq -o %PPID -x "$(basename "$0")" && exit
 while :; do
     rm -r ~/.themes/* 2> /dev/null
     rsync -av --progress /usr/share/themes/* ~/.themes/ --exclude Windowck

bin/periodic/fix-theming

@@ -20,6 +20,7 @@ sync_icon_theme() {
 	sed -i "s/^icon_theme=.*$/icon_theme=$icon_theme/" "$HOME"/.config/qt6ct/qt6ct.conf
 }
 
+pidof -sq -o %PPID -x "$(basename "$0")" && exit
 while :; do
 	# Get the current system theme
 	theme_new=$(xfconf-query -c xsettings -p /Net/ThemeName)