bench/suite_bench: use snake case for input files

rust identifiers may not contain -

use _ for files also to avoid confusion of having two names

tests/bench/Makefile

@@ -9,7 +9,7 @@ DJOT_JS_SRC=$(shell find ${DJOT_JS}/src -name '.ts')
 mod.rs: ${TEST_DJ} html
 	echo "use crate::suite_test;" > $@
 	for name in ${TEST}; do \
-		name_snake=$$(basename -a $$name | sed 's/-/_/g'); \
+		name_snake=$$(basename -a $$name); \
 		skip_reason=$$(grep -E "^$${name_snake}:" skip | cut -d: -f2); \
 		[ -n "$$skip_reason" ] && echo "#[ignore = \"$${skip_reason}\"]"; \
 		echo "#[test]"; \