owncloudwizard: properly initialize _account memember

This fixes Coverity CID 12927
wizard setuppage: Clean up and properly initialize members

This fixes Coverity CID 12926
Cleanup member initialization in Theme

This fixes coverity issue 12925
syncengine: properly initialize all members in ctor

This fixes Coverity CID 12922
Legacy Propagator: Properly initialize members

This fixes coverity CID 12919
Folderwizard: Properly initialize all members

This fixes coverity CID 12916
Remove previously unused member

This fixes Coverity CID 12915
Folder: Removed unused member _pathWatcher

This fixes Coverity CID 12914