Fix SqlitePlatform FK compare for quoted columns

[mvorisek]

Q	A
Type	bug
Fixed issues	n/a

Summary

The previous FKs are dropped if the $fromTable has quoted columns - https://github.com/doctrine/dbal/blob/3.3.7/src/Platforms/SqlitePlatform.php#L1261

all other column names are unquoted, thus the columns from $fromTable must be as well

also make some SqlitePlatform methods protected, so (hot)fixing issues like these is possible on the dependent packages

[morozov]

Please document the problem and provide an integration test.

[morozov]

Closing due to the lack of feedback.

[mvorisek]

I was on holidays, please reopen this issue, although the issue should be obvious (as the 2nd name in the comparsion is unquoted), I am happy to provide a test.

[morozov]

Closing due to the lack of feedback.