selftests: remove reference to prime_numbers.sh

Remove a leftover shell script reference from commit 313b38a
("lib/prime_numbers: convert self-test to KUnit").

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202502171110.708d965a-lkp@intel.com
Fixes: 313b38a ("lib/prime_numbers: convert self-test to KUnit")
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Link: https://lore.kernel.org/r/20250217-fix-prime-numbers-v1-1-eb0ca7235e60@gmail.com
Signed-off-by: Kees Cook <kees@kernel.org>

Author: tamird

tools/testing/selftests/lib/Makefile

@@ -4,5 +4,5 @@
 # No binaries, but make sure arg-less "make" doesn't trigger "run_tests"
 all:
 
-TEST_PROGS := printf.sh bitmap.sh prime_numbers.sh scanf.sh
+TEST_PROGS := printf.sh bitmap.sh scanf.sh
 include ../lib.mk