WebSearch: respect default `rg` in Advanced Search

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-1.0' into maint-1.1

* maint-1.0:
  WebSearch: respect default `rg` in Advanced Search

Conflicts:
	modules/websearch/lib/websearch_webcoll.py
Merge branch 'maint-1.1'

* maint-1.1:
  WebSearch: respect default `rg` in Advanced Search