USES=kde: add missing component entries

• Add missing component entries for KDE Frameworks 5:
  • baloo-widgets
  • libkcddb
  • libcompactdisc
• Remove components from _USE_KDE4_ALL that are defined in _USE_KDE_BOTH.

Note that baloo (for KDE Frameworks 5) is explicitly defined in the
KDE Frameworks 5 section, and not the common section.

Approved by: adridg (KDE)