access/dshow: use VLC_CODEC_BGR24 instead of VLC_CODEC_RGB24M

MEDIASUBTYPE_RGB24 corresponds to VLC_CODEC_BGR24 [1]

[1] https://learn.microsoft.com/en-us/windows/win32/directshow/uncompressed-rgb-video-subtypes

modules/access/dshow/dshow.cpp

@@ -626,12 +626,6 @@ static void SetRGBMasks( vlc_fourcc_t i_fourcc, video_format_t *fmt )
 {
     switch( i_fourcc )
     {
-        case VLC_CODEC_RGB24M:
-            /* This is in BGR format */
-            fmt->i_bmask = 0x00ff0000;
-            fmt->i_gmask = 0x0000ff00;
-            fmt->i_rmask = 0x000000ff;
-            break;
         default:
             return;
     }
@@ -940,7 +934,7 @@ static int GetFourCCPriority( vlc_fourcc_t i_fourcc )
     case VLC_CODEC_YV12:
     case VLC_FOURCC('a','r','a','w'):
         return 8;
-    case VLC_CODEC_RGB24M:
+    case VLC_CODEC_BGR24:
         return 7;
     case VLC_CODEC_YUYV:
     case VLC_CODEC_BGRX:

modules/access/dshow/filter.cpp

@@ -116,7 +116,7 @@ vlc_fourcc_t GetFourCCFromMediaType( const AM_MEDIA_TYPE &media_type )
             else if( media_type.subtype == MEDIASUBTYPE_RGB565 )
                i_fourcc = VLC_CODEC_RGB16;
             else if( media_type.subtype == MEDIASUBTYPE_RGB24 )
-               i_fourcc = VLC_CODEC_RGB24M;
+               i_fourcc = VLC_CODEC_BGR24;
             else if( media_type.subtype == MEDIASUBTYPE_RGB32 )
                i_fourcc = VLC_CODEC_BGRX;
             else if( media_type.subtype == MEDIASUBTYPE_ARGB32 )