Fix SubmoduleOp tests

Patch set 31 of change I91bbdffa added an optimisation to prevent an
unnecessary call to submoduleSubscriptions().delete(), but neglected
to update the unit test mock expectations, thus causing them to fail.

Remove unneeded expect() calls in the unit tests.

Also, in future, remember to always run the unit tests again even if
"only making a trivial change" :(

Change-Id: I2d15c69028812a1a11382e854377605c404b3044
1 file changed