Pass frame value to getTile

[annehaley]

When using django-large-image to get tiles from a multiframe image, the frame value should be passed to the getTile call, not just the style. This PR makes a small change to ensure that any frame value passed to the style will also get passed to the getTile call.

To illustrate the difference in behavior, an example multiframe geospatial image (download here) has transparency applied to nodata values.

import large_image

path = 'flood_transparency_test.tif'
projection = 'epsg:3857'
tile_params = dict(x=619, y=757, z=11)
style = dict(palette='viridis', nodata=-1, min=0, max=1)
frame = 5

The following images are examples of the difference between passing frame as a tile param versus a style param.

As a tile param:

src = large_image.open(path, projection=projection, style=style, encoding='PNG')
tile = src.getTile(**tile_params, frame=frame)

As a style param:

style['frame'] = frame
src = large_image.open(path, projection=projection, style=style, encoding='PNG')
tile = src.getTile(**tile_params)

When frame is only expressed via style, the transparency mask applied to the tile will belong to the first frame but visible values will belong to the specified frame.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.60%. Comparing base (50cf80f) to head (0396748).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   95.58%   95.60%   +0.01%     
==========================================
  Files          16       16              
  Lines         679      682       +3     
==========================================
+ Hits          649      652       +3     
  Misses         30       30              

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