pqProxyWidget: fix group widget naming logic
When multiple group widgets of same type were created in a pqProxyWidget, they all got the same name. Fixed that.
Fixes #20271 (closed).
Closes #20271 (closed)
When multiple group widgets of same type were created in a pqProxyWidget, they all got the same name. Fixed that.
Fixes #20271 (closed).
Closes #20271 (closed)