Fix FRED play/media button transparency and disabled state #7571

Job	Run time
Mac (Debug, clang, x86_64)	7m 1s
Mac (Release, clang, arm64)	7m 34s
Windows (FastDebug, MSVC, Win32)	13m 48s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=ON)	13m 48s
Linux (Debug, clang-16)	10m 1s
Linux (Release, clang-16)	18m 9s
Mac (Release, clang, x86_64)	11m 1s
Mac (Debug, clang, arm64)	6m 49s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	4m 37s
Linux (Debug, gcc-9)	18m 34s
Windows (Debug, MSVC, Win32)	13m 44s
Windows (FastDebug, MSVC, x64)	13m 47s
Linux (Debug, gcc-13)	13m 25s
Linux (Release, gcc-9)	15m 57s
Linux (Release, gcc-13)	10m 21s
Linux (Release, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=OFF)	7m 36s
Linux (Debug, gcc-13, -DFSO_BUILD_WITH_OPENGL=OFF -DFSO_BUILD_WITH_VULKAN=ON)	14m 38s
Windows (Release, MSVC, Win32)	13m 43s
Windows (Debug, MSVC, x64)	13m 31s
Windows (Release, MSVC, x64)	13m 47s
	4h 1m 51s

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