Fix Words & Chars String on katestatusbar.

Summary:
The current string I think have some issues, for example:

This is a text file:

ABC DEF GHI JKL

When I selected "DEF GHI", I expect this message:

Words 2/4, Chars 6/12

but the current message shows:

Words 4/2, Chars 12/6

This is a fix of this issue.

Reviewers: Kate, dhaumann

Reviewed By: Kate, dhaumann

Subscribers: cullmann, pino, kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D19798