tests/kms_force_connector: fix assertion when VGA is already connected
tests/kms_force_connector: fix assertion when VGA is already connected

Compare the number of modes available when the edid is reset with the
number before the edid was overridden.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82230
Signed-off-by: Thomas Wood <b9025d6a953b68f894a0f6a80fd2af6d55b0badd@intel.com>

yipdw/intel-gpu-tools,tiagovignatti/intel-gpu-tools,erikarn/intel-gpu-tools,chenxianqin/intel-gpu-tools,erikarn/intel-gpu-tools,dlespiau/checkmate-test-igt,mv0/intel-gpu-tools,chenxianqin/intel-gpu-tools,yipdw/intel-gpu-tools,dlespiau/checkmate-test-igt,tiagovignatti/intel-gpu-tools,yipdw/intel-gpu-tools,mv0/intel-gpu-tools,dlespiau/checkmate-test-igt,chenxianqin/intel-gpu-tools,dlespiau/checkmate-test-igt,mv0/intel-gpu-tools,erikarn/intel-gpu-tools,chenxianqin/intel-gpu-tools,tiagovignatti/intel-gpu-tools,yipdw/intel-gpu-tools,mv0/intel-gpu-tools,erikarn/intel-gpu-tools,tiagovignatti/intel-gpu-tools