kdebase4-runtime: fixed mousewheel volume step for Kmix applet in systemtray

This update fixes the following issue with kdebase4-runtime:
- bnc#835309, kde#316546: fixed mousewheel volume step for kmix applet in systemtray.

Fixed bugs
bnc#835309
kmix applet in systemtray mousewheel volume step is too ridiculously big
kde#316546
KStatusNotifierItem capture mouse wheel events three times. kmix and amarok get 3x volume change
Selected Binaries
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