Revert "Rename to test_mysql_strict_mode_disabled_dont_override_global_sql_mode"

This pull request reverts commit babc24c1b07c1fd58b9b3249b0256f9b0d45c0f0 to `4-1-stable` since `1a9d267f` merged to it.  Refer #16196 which has been merged to master.

This reverts commit babc24c1b07c1fd58b9b3249b0256f9b0d45c0f0.

Conflicts:

	activerecord/test/cases/adapters/mysql/connection_test.rb
	activerecord/test/cases/adapters/mysql2/connection_test.rb