configure: fix --help indentation #11142
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AC_ARG_ENABLE seems to only trim off whitespace from the start and end of its help-string argument, while prepending two spaces of indentation to all lines.
This means that the two spaces of indentation between the --enable-rtsp and the --disable-rtsp line were not removed causing ./configure --help to print:
I removed the indentation to fix the issue, now it prints: