[processing] Fix Import Geotagged photos algorithm incorrectly

assigns form widgets when saving the results to GPKG or other
formats which automatically insert new fields into the result
layer

Also tweak widget behavior for newer resource widget functionality

src/analysis/processing/qgsalgorithmimportphotos.cpp

@@ -236,13 +236,17 @@ class SetEditorWidgetForPhotoAttributePostProcessor : public QgsProcessingLayerP
         // photo field shows picture viewer
         config.insert( QStringLiteral( "DocumentViewer" ), 1 );
         config.insert( QStringLiteral( "FileWidget" ), true );
-        vl->setEditorWidgetSetup( 0, QgsEditorWidgetSetup( QStringLiteral( "ExternalResource" ), config ) );
+        config.insert( QStringLiteral( "UseLink" ), true );
+        config.insert( QStringLiteral( "FullUrl" ), true );
+        vl->setEditorWidgetSetup( vl->fields().lookupField( QStringLiteral( "photo" ) ), QgsEditorWidgetSetup( QStringLiteral( "ExternalResource" ), config ) );
 
         config.clear();
         // path field is a directory link
         config.insert( QStringLiteral( "FileWidgetButton" ), true );
         config.insert( QStringLiteral( "StorageMode" ), 1 );
-        vl->setEditorWidgetSetup( 2, QgsEditorWidgetSetup( QStringLiteral( "ExternalResource" ), config ) );
+        config.insert( QStringLiteral( "UseLink" ), true );
+        config.insert( QStringLiteral( "FullUrl" ), true );
+        vl->setEditorWidgetSetup( vl->fields().lookupField( QStringLiteral( "directory" ) ), QgsEditorWidgetSetup( QStringLiteral( "ExternalResource" ), config ) );
       }
     }
 };