MAINTAINERS: Make formating of ffmpeg-security entry the same as others

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

MAINTAINERS

@@ -60,11 +60,7 @@ mailing lists                           Baptiste Coudurier, Lou Logan
 Google+                                 Paul B Mahol, Michael Niedermayer, Alexander Strasser
 Twitter                                 Lou Logan, Reynaldo H. Verdejo Pinochet
 Launchpad                               Timothy Gu
-ffmpeg-security                         Andreas Cadhalpun
-                                        Carl Eugen Hoyos
-                                        Clément Bœsch
-                                        Michael Niedermayer
-                                        Reimar Doeffinger
+ffmpeg-security                         Andreas Cadhalpun, Carl Eugen Hoyos, Clément Bœsch, Michael Niedermayer, Reimar Doeffinger
 
 
 libavutil