Don't enable Run CPU Tests without the presence of g_Config.memCardDirectory/pspautotests/tests. Restore the previous PSP_CoreParameter().pixelWidth & PSP_CoreParameter().pixelHeight before exiting RunTests.
Merge pull request #4146 from thedax/fixRunCPUTests

Don't enable Run CPU Tests without the presence of g_Config.memCardDirectory/pspautotests/tests.