Fix shellcheck problems

Signed-off-by: Severin Kaderli <severin.kaderli@gmail.com>

system/bin/watch.sh

@@ -20,11 +20,11 @@ FILENAME=$(basename "${FILE}")
 
 # The rest of the arguments is the command
 shift
-COMMAND="${@}"
+COMMAND="${*}"
 
 print_header "Watching ${FILE}"
 while inotifywait -qq -e close_write "${FILE}";
 do
     print_log "${FILENAME} has changed" "Executing command"
-    $($COMMAND)
+    $COMMAND
 done