Prevent opening P TGA images without a palette #7797
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radarhere
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Using http://www.paulbourke.net/dataformats/tga/ as the TGA specification, this PR makes two changes
colormaptypeset to zero, indicating that it does not have a color map. According to "DATA TYPE 1: Color-mapped images" in the spec though, when "Image Type Code" (imagetype) is 1, which it is, then the image is "DATA TYPE 1" and "Color Map Type" should be 1. So this image is actually invalid. This PR will be more flexible though, and just set the image mode to L instead of P, due to the lack of palette.