javascript/Makefile: Remove obsolete disable of array-bounds warning.

This was fixed in bb70874111

Signed-off-by: Damien George <damien@micropython.org>

ports/javascript/Makefile

@@ -53,7 +53,4 @@ test: $(BUILD)/micropython.js $(TOP)/tests/run-tests.py
 	$(eval DIRNAME=ports/$(notdir $(CURDIR)))
 	cd $(TOP)/tests && MICROPY_MICROPYTHON=../ports/javascript/node_run.sh ./run-tests.py -j1
 
-# Disable errors for array-bounds warnings on "sp[-MP_OBJ_ITER_BUF_NSLOTS + 2]" access.
-$(BUILD)/py/vm.o: CFLAGS += -Wno-error=array-bounds
-
 include $(TOP)/py/mkrules.mk