Fixed faulty mysql login data for linux

changed USER to USERNAME in .env

Commons/Data/Database.js

@@ -1,16 +1,18 @@
 const sql = require('mysql');
 
 const Database = async (db) => {
+
     const server = sql.createConnection({
         host     : db.HOST,
-        user     : db.USER,
-        password : db.PASSWORD,
+        user     : db.USERNAME,
+        password : db.PASSWORD
+        ,
         database : db.DATABASE
     });
     
     server.connect(function(err) {
         if (err) {
-            console.error('error connecting: ' + err.stack);
+            console.error('error connecting Database in Data.Database: ' + err.stack);
             process.exit(1)
         }
     });