Partially fix tests

Since mgit is not a public executable it will not be present in $PATH -
so we must use %{exe:...} over %{bin:...}.

The fix is partial because the (enabled_if ...) stanza doesn't work
correctly for me at least.

test/dune

@@ -3,14 +3,14 @@
  (applies_to simple)
  (locks p9418)
  (enabled_if (= "true" {%read:git-daemon}))
- (deps %{bin:mgit}))
+ (deps %{exe:../app/mgit.exe}))
 
 (cram
  (package git-kv)
  (applies_to fold)
  (locks p9418)
  (enabled_if (= "true" {%read:git-daemon}))
- (deps %{bin:mgit}))
+ (deps %{exe:../app/mgit.exe}))
 
 (executable
  (name git_daemon_exists)

test/fold.t

@@ -11,14 +11,14 @@ Batch operation
   > exists /bar
   > quit
   > quit
-  /"bar" does not exists
+  /bar does not exists
   $ mgit git://localhost/simple#main <<EOF
   > list /
   > get /bar
   > get /foo
   > quit
-  - bar
-  - foo
+  - /bar
+  - /foo
   00000000: 4769 7420 726f 636b 7321                 Git rocks!
   00000000: 4865 6c6c 6f20 576f 726c 6421            Hello World!
   $ cd simple

test/simple.t

@@ -35,7 +35,7 @@ Simple test of our Git Key-Value store
   > get /bar
   > get /foo
   > quit
-  + /"bar"
+  + /bar
   * /
   00000000: 4769 7420 726f 636b 7321 0a              Git rocks!.
   00000000: 4865 6c6c 6f20 576f 726c 6421 0a         Hello World!.