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TGA Plugin: Fix reading of CMapDepth

It's specified to be one byte but the old code used to read an int of two bytes. Maybe this wasn't noticed because the following byte often has a value of zero.

This fixes oss-fuzz issue 50741 which is an integer overflow resulting from the too large value.

[ChangeLog] Fixed reading of TGA files with a non-zero X-origin

Pick-to: 6.5 6.4 6.2 5.15 Change-Id: I989bffd0e4e03caf6737e1ce085247ed54e40db0 Reviewed-by: Eirik Aavitsland Reviewed-by: Qt CI Bot Reviewed-by: Robert Löhning (cherry picked from commit feb78640)

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