Fix changed annotations not marked as dirty
Fix changed annotations not marked as dirty

Events such as mouse up/down can cause a change to the appearance of a
widget annotation. That the change has happened is flagged by incrementing
the iteration count of the appearance stream. The widget is then recognised
as dirty when the ap_iteration value, stored in the pdf_widget structure,
differs from the appearance stream's actual iteration.

This commit removes a line of code that wrongly reset the iteration to 1
each time load_or_create_form was called, hence masking the widget being
dirty.

sebras/mupdf,fluks/mupdf-x11-bookmarks,TamirEvan/mupdf,ccxvii/mupdf,ArtifexSoftware/mupdf,sebras/mupdf,TamirEvan/mupdf,ArtifexSoftware/mupdf,ArtifexSoftware/mupdf,muennich/mupdf,muennich/mupdf,ccxvii/mupdf,muennich/mupdf,fluks/mupdf-x11-bookmarks,ArtifexSoftware/mupdf,sebras/mupdf,TamirEvan/mupdf,ccxvii/mupdf,sebras/mupdf,muennich/mupdf,fluks/mupdf-x11-bookmarks,ArtifexSoftware/mupdf,TamirEvan/mupdf,TamirEvan/mupdf,TamirEvan/mupdf,ccxvii/mupdf,TamirEvan/mupdf,sebras/mupdf,muennich/mupdf,ArtifexSoftware/mupdf,muennich/mupdf,fluks/mupdf-x11-bookmarks,muennich/mupdf,TamirEvan/mupdf,ArtifexSoftware/mupdf,ArtifexSoftware/mupdf,fluks/mupdf-x11-bookmarks,fluks/mupdf-x11-bookmarks,fluks/mupdf-x11-bookmarks,ccxvii/mupdf,ccxvii/mupdf,sebras/mupdf