Promote fixed test after Dune upgrade

tests/test-dirs/locate/in-implicit-trans-dep.t/run.t

@@ -1,12 +1,17 @@
   $ dune build @check
 
-FIXME: When the deifinition is in one of the implicit transitive dependencies
-Merlin does not found the file in the source path provided by Dune. One possible
-fix would be for Dune to provide additional source path for "externatl" deps.
+When the deifinition is in one of the implicit transitive dependencies Merlin
+used to not find the file in the source path provided by Dune. 
   $ $MERLIN single locate -look-for ml -position 1:15 \
   > -filename bin/main.ml <bin/main.ml
   {
     "class": "return",
-    "value": "'Lib1.t' seems to originate from 'Lib2' whose ML file could not be found",
+    "value": {
+      "file": "$TESTCASE_ROOT/src/lib2/lib2.ml",
+      "pos": {
+        "line": 1,
+        "col": 0
+      }
+    },
     "notifications": []
   }