igt@kms_invalid_mode@subtests - skip - No dynamic tests executed

https://gfx-ci.igk.intel.com/cibuglog-ng/testresult/1876068486?query_key=aedcd17e05c3a9e7bc34d06e81f357e6c433f894

Using IGT_SRANDOM=1723774026 for randomisation
Opened device: /dev/dri/card0
Max dotclock: 1305600 kHz
Starting subtest: bad-vtotal
No dynamic tests executed.
Subtest bad-vtotal: SKIP (0.000s)