[FIX] wrong width/height for tile_70 (mstile 70x70 (png))

[ulf-f]

I assume it is a c&p error in the tile_70 file the upload from the file always shows the error "Invalid file width" with a file which is 70x70 because the width and height was copied from the file below and is still 144x144 instead of 70x70.

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