obs-plugintemplate uses the `obs_libraries` component to install
obs components required for plugin development. The need of the separate
`pdbs` directory was removed a while ago (as PDB target installation
can be flagged as `OPTIONAL` and enabled for specific configurations
only). This part was overlooked in that change.
Windows and Linux do not require a contained application bundle to run
and debug OBS - as such targets can and should be copied independently
from the main OBS application target.
Also silences the output of the `install` step that sets up those files.
