Promote corrected test

Author: voodoos

tests/test-dirs/config/issue1388.t

@@ -5,11 +5,10 @@
   > B +../cerberus/build
   > EOF
 
-FIXME include_dir should also replace the `+` by the lib path
   $ echo "" | $MERLIN single dump-configuration -filename test.ml | \
   > grep -A2 'include_dirs\|source_path\|build_path'
         "include_dirs": [
-          "$TESTCASE_ROOT/+../cerberus/flags"
+          "+../cerberus/flags"
         ],
   --
         "build_path": [
@@ -24,9 +23,9 @@ FIXME include_dir should also replace the `+` by the lib path
     "class": "return",
     "value": [
       "$TESTCASE_ROOT",
-      "$TESTCASE_ROOT/+../cerberus/flags",
+      "/my/cerberus/flags",
       "/my/cerberus/build",
-      "lib/ocaml"
+      "/my/std"
     ],
     "notifications": []
   }