wic: code cleanup: superfluous-parens

Removed unncecessary parents after 'if' 'del' and 'print' keywords.
Fixed pyling warning: Unnecessary parens after 'xxx' keyword

(From OE-Core rev: a64604d11f75973b4c2347fa2669da9889e44013)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/plugin.py

@@ -103,7 +103,7 @@ class PluginMgr(object):
                                 % (os.path.basename(pdir), mod, err)
                             msger.warning(msg)
 
-            del(sys.path[0])
+            del sys.path[0]
 
     def get_plugins(self, ptype):
         """ the return value is dict of name:class pairs """