Fix search terms clearing post type filter from forms. #3891
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Description of the Change
Fixes an issue where the default post type that is set from an
<input name="post_type">
field in the search form would be cleared if a new search term was entered.Note that this is only true when the Post Type facet/filter is not in use. If the post type facet is enabled, it will be cleared as before. This is the expected behaviour for filters.
Closes #3868
How to test the Change
Changelog Entry
Fixed - An issue in Instant Results where a default post type filter that is set by a field in the search form would be cleared if a new search term was entered.
Credits
Props @JakePT @burhandodhy
Checklist: