Change MySQL/MariaDB Database Name Limit to 30 characters.

func/main.sh

@@ -649,8 +649,8 @@ is_date_format_valid() {
 # Database user validator
 is_dbuser_format_valid() {
     exclude="[!|@|#|$|^|&|*|(|)|+|=|{|}|:|,|<|>|?|/|\|\"|'|;|%|\`| ]"
-    if [ 17 -le ${#1} ]; then
-        check_result $E_INVALID "mysql username can be up to 16 characters long"
+    if [ 31 -le ${#1} ]; then
+        check_result $E_INVALID "mysql username can be up to 30 characters long"
     fi
     if [[ "$1" =~ $exclude ]]; then
         check_result $E_INVALID "invalid $2 format :: $1"