Show only valid users

src/freedombone-config

     name=()
     for u in ${users_array[@]}
     do
-        i=$((i+1))
-        W+=($i "$u")
-        name+=("$u")
+        if [[ $(is_valid_user "$u") == "1" ]]; then
+            i=$((i+1))
+            W+=($i "$u")
+            name+=("$u")
+        fi
     done
 
     user_index=$(dialog --backtitle $"Freedombone Configuration" --title $"Select User" --menu $"Select one of the following:" 24 40 17 "${W[@]}" 3>&2 2>&1 1>&3)

src/freedombone-controlpanel

     name=()
     for u in ${users_array[@]}
     do
-        i=$((i+1))
-        W+=($i "$u")
-        name+=("$u")
+        if [[ $(is_valid_user "$u") == "1" ]]; then
+            i=$((i+1))
+            W+=($i "$u")
+            name+=("$u")
+        fi
     done
 
     user_index=$(dialog --backtitle $"Freedombone Control Panel" --title $"Select User" --menu $"Select one of the following:" 24 40 17 "${W[@]}" 3>&2 2>&1 1>&3)