Fix Python smart indent wrongly when comment line ends in colon #640

Job	Run time
before_build	26s
build_windows_cmake (Release, x64, amd64)	5m 7s
build_windows (Release, x64)	3m 52s
build_windows (Release, Win32)	3m 41s
build_windows_msys2 (Release, x86_64)	5m 18s
build_windows (Release, ARM64)	4m 19s
build_windows_msys2 (Release, i686)	4m 44s
build_windows (Debug, x64)	5m 58s
build_windows_msys2 (Debug, x86_64)	4m 39s
build_windows (Debug, Win32)	4m 9s
build_windows_msys2 (Debug, i686)	4m 27s
build_windows (Debug, ARM64)	3m 13s
	49m 53s

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