[fix] : Fixed user check

Author: Hayao0819

modules/share/airootfs.any/root/customize_airootfs.sh

@@ -156,7 +156,7 @@ function create_user () {
     fi
     set -u
 
-    if user_check "${_username}"; then
+    if ! user_check "${_username}"; then
         useradd -m -s ${usershell} ${_username}
         groupadd sudo
         usermod -U -g ${_username} ${_username}

system/aur.sh

@@ -26,7 +26,7 @@ function user_check () {
 }
 
 # Creating a aur user.
-if user_check "${aur_username}"; then
+if ! user_check "${aur_username}"; then
     useradd -m -d "/aurbuild_temp" "${aur_username}"
 fi
 mkdir -p "/aurbuild_temp"