gnu: Remove trailing periods from synopsis.

gnu: Remove trailing periods from synopsis.

* gnu/packages/emacs.scm (emacs-smart-mode-line): Update synopsis.
* gnu/packages/gnustep.scm (wmfire): Update synopsis.
* gnu/packages/haskell.scm (ghc-socks): Update synopsis.
* gnu/packages/kde-frameworks.scm (oxygen-icons): Update synopsis.
* gnu/packages/openstack.scm (python-bandit): Update synopsis.
* gnu/packages/perl.scm (perl-test-trap): Update synopsis.
* gnu/packages/python.scm (python-backports-abc): Update synopsis.
* gnu/packages/ruby.scm (python-cryptography-vectors): Update synopsis.

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