gnu: sbcl-graph: Fix build.

gnu: sbcl-graph: Fix build.

Rename the asd files so that they have the same name as the ASDF
system definitions.

* gnu/packages/lisp-xyz.scm (sbcl-graph)[arguments]: Use 'graph-test.asd'
  instead of 'graph.test.asd' for test-asd-file.
  (sbcl-graph-dot)[arguments]: Use 'graph-dot.asd' instead of 'graph.dot.asd'
  for test-asd-file.
  (sbcl-graph-json)[arguments]: Use 'graph-json.asd' instead of
  'graph.json.asd' for test-asd-file.
* gnu/packages/patches/sbcl-graph-asdf-definitions.patch: Update accordingly.