Made cleaner code and remove unneccessary checks.

1. combine the regexes into one. The only thing that needs to be captured
is the alias. Used a non-capturing group for "AS " to avoid confusion and
have cleaner regex. It tries to match "Table.Column Alias" or
"Table.Column AS Alias". (line 861)
2. No fallback on line 865 like "$column['table'] . '.' .
$column['column']" this wouldn't make sense as this can not be possible
when it's a wrapped query. Better not insert some random SQL that's gonna
confuse the hell out of everybody.
3. Removed "($column['hasTable'] ? $column['table']  . '.' : '') .
$column['column']" because the original regex always tries to match the
table name. Therefor hasTable will always be true or the entire function
fails anyway. (this references line 868 now) (this was unit tested on
mysql, postgresql and sql server and did not increase errors/failures)