tests: arch: arm: arm_irq_vector_table: Do not run if GEN_ISR_TABLES=y

The Renesas RA ICU forcibly enables GEN_ISR_TABLES, and it remains
enabled even if it is disabled in prj.conf.
Adding `not CONFIG_GEN_ISR_TABLES` to the filter condition to skip
this case.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>