Fix non-dropdown commands

These should not be checked as if they are programs.

tdrop

@@ -165,7 +165,8 @@ shift "$((OPTIND-1))"
 program=$1
 
 # check that the program is not a path and does not contain flags
-if ! type "$program" 2> /dev/null; then
+if [[ ! $program =~ ^(current|auto_hide|auto_show|toggle_auto_hide)$ ]] && \
+	   ! type "$program" 2> /dev/null; then
 	echo >&2 "The program should be in PATH and not contain flags." | \
 		tee -a "$MUTDROP_PATH"/log
 	exit 1