Testcase remains checked when modified, but no test is run.

## Steps to reproduce
Create a testcase with parameters.
Check the box next to the testcase in the AltTester Editor window.
Modify one parameter of the testcase.
See how the test remains checked in the list.
Press run selected tests.

## Actual result

No tests are run.

## Expected result

The testcase should run if it's checked or inform the user that the tests were modified and the testcase got unchecked.