Remove incorrect strict test for test-suites for test_module_config

I misunderstood our desire to eventually migrate all
`test_module_config` modules -> "general-tests" for the requirement that
it must be used now.

While working on converting these modules to use symlinks rather than
copies of data files, I noticed a problem if the derived test was in
"general-tests", but the base test was in "device-tests". The symlink
would not have a base to point to in general-tests.zip.

Allow the derived tests to be in other suites for now.

Test: go test ./tradefed_modules/
Test: m blueprint_tests
Change-Id: I9524d6c3964db6de38fc3c4cb4c5bc493dadc0db