tests/run-tests.py: Skip additional tests when slice unavailable.

Both of these tests require slice to be enabled.
Signed-off-by: Damien George <damien@micropython.org>

tests/run-tests.py

@@ -563,6 +563,7 @@ def run_tests(pyb, tests, args, result_dir, num_threads=1):
     # These tests don't test slice explicitly but rather use it to perform the test
     misc_slice_tests = (
         "builtin_range",
+        "bytearray1",
         "class_super",
         "containment",
         "errno1",
@@ -573,6 +574,7 @@ def run_tests(pyb, tests, args, result_dir, num_threads=1):
         "memoryview_gc",
         "object1",
         "python34",
+        "string_format_modulo",
         "struct_endian",
     )