import: composer: Move tests to tests/import/composer.scm.

* tests/composer.scm: Move to tests/import/composer.scm.
* Makefile.am: Refresh it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

Makefile.am

@@ -546,7 +546,6 @@ SCM_TESTS =					\
   tests/challenge.scm				\
   tests/channels.scm				\
   tests/combinators.scm			\
-  tests/composer.scm				\
   tests/containers.scm				\
   tests/cpio.scm				\
   tests/cve.scm				\
@@ -562,6 +561,7 @@ SCM_TESTS =					\
   tests/grafts.scm				\
   tests/graph.scm				\
   tests/gremlin.scm				\
+  tests/import/composer.scm			\
   tests/import/cpan.scm				\
   tests/import/cran.scm				\
   tests/import/crate.scm			\