Sequencer: Use Same Sampling As Rendering.

When subsampling was introduced in VSE it was disabled during
editing. Only when rendering it was enabled. This lead to
cache being different between editing and rendering. Leading
to confusion.

This PR will enabled the subsampling when editing. This way
it is more consistent.

Pull Request: https://projects.blender.org/blender/blender/pulls/105612

source/blender/sequencer/intern/render.c

@@ -529,7 +529,7 @@ static void sequencer_preprocess_transform_crop(
       break;
     case SEQ_TRANSFORM_FILTER_NEAREST_3x3:
       filter = IMB_FILTER_NEAREST;
-      num_subsamples = context->for_render ? 3 : 1;
+      num_subsamples = 3;
       break;
   }