SQLiteGrammar compileDropColumn() ignores connection table prefix

[tomlankhorst]

• Laravel Version: 5.5.28
• PHP Version: 7.1.8
• Database Driver & Version: Doctrine DBAL 2.6.3

Description:

SQLiteGrammar ignores table prefixes when ordered to compile a dropColumn statement.
This exception is thrown when SQLiteGrammar queries for existing columns in compileDropColumn resulting in a similar exception:

Doctrine\DBAL\Schema\SchemaException : There is no column with name 'col_name' on table 'table_name_without_prefix'.

This happens when using SQLite driver with a table prefix configured in the connection.

Steps To Reproduce:

1. Configure a (memory stored) SQLite connection with a table prefix.
2. Create a migration that creates a column.
3. Create a migration that drops the same column.

Notes

There is currently no test for SQLite grammar compileDropColumn() and prefixes are tested neither. It seems to me that creating the former would require me to mock many objects (right?). I've fixed the latter by adding a prefix to the grammar in DatabaseSQLiteSchemaGrammarTest though.