[MCPE-169579] Diagonal banner patterns are named incorrectly

The names of the "Per Bend" banner patterns are incorrect. This is due to an error in the naming of the texture files:

Direction	Current name	Correct name
Southwest - Northeast	Per Bend	Per Bend Sinister Inverted
Southwest - Northeast	Per Bend Inverted	Per Bend Sinister
Southeast - Northwest	Per Bend Sinister	Per Bend Inverted
Southeast - Northwest	Per Bend Sinister Inverted	Per Bend

This can be noticed when comparing the names to the "Bend" patterns, which are correct. The same directions have different names:

Direction	Pattern
Southeast - Northwest	Bend
Southwest - Northeast	Bend Sinister

As of Preview 1.20.40.20, banner shields are also affected.

Notes: The right way to fix this would be correcting the texture files and making a versioned change to how the game applies the patterns' textures.