Add missing targa palette entry size handling
The targa (TGA) reader had an oddly empty "ELSE" clause in the code that reads palette entries, so while 24b entries worked the 16b and 32b variants didn't. This would typically show an all black image (all palette entries uninitialised). Tested with some sample 16b images, 32b ones should be right by inspection. Version 1.49. Tagged as 'ChangeFSI-1_49'
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