Merge branch 'soundtest-fix' into 'master'

Init MUSICDEFs regardless of music state

See merge request STJr/SRB2!532

src/d_main.c

@@ -1285,9 +1285,10 @@ void D_SRB2Main(void)
 		I_StartupSound();
 		I_InitMusic();
 		S_InitSfxChannels(cv_soundvolume.value);
-		S_InitMusicDefs();
 	}
 
+	S_InitMusicDefs();
+
 	CONS_Printf("ST_Init(): Init status bar.\n");
 	ST_Init();