fix: remove disabled test stanza for deleted tests

Signed-off-by: Sachin Beniwal <s474996633@gmail.com>

Author: benodiwal

test/blackbox-tests/test-cases/pkg/merlin/dune

@@ -1,9 +1,3 @@
 (cram
  (deps helpers.sh)
  (applies_to :whole_subtree))
-
-;; issues with dev tool lock dirs in source
-
-(cram
- (applies_to dev-tool-merlin-no-lock-dir dev-tool-merlin-no-ocaml-lockfile)
- (enabled_if false))