Reduce MySQL keyword list to only reserved ones

Author: nene

src/languages/mysql/mysql.functions.ts

@@ -402,7 +402,7 @@ export const functions = flatKeywordList({
     'UNIX_TIMESTAMP',
     'UPDATEXML',
     'UPPER',
-    'USER',
+    // 'USER',
     'UTC_DATE',
     'UTC_TIME',
     'UTC_TIMESTAMP',