Also fixes:
- forcing the annotation scope to "full schematic" when run
as a prerequisite to Generate Netlist.
- a long-standing bug where displaying extra items in a dialog
would mess up the height of the HTML_REPORT_PANEL (becasue
we were setting the html window's height rather than its
parent flexgrid.
- initializing the annotation radio buttons to safe values
(full schematic and keep existing)
Fixes: lp:1750062
* https://bugs.launchpad.net/kicad/+bug/1750062