gnu: owncloud-client: Update to 2.2.4.

* gnu/packages/owncloud.scm (owncloud-client): Update to 2.2.4.
[arguments]: Enable tests, disable two failing tests.
[inputs]: Remove python-wrapper, qt, ruby.  Add qtbase, qtwebkit.
Move perl ...
[native-inputs]: ... to here.  Add cmocka and qttools.