[grilo] grl-metadata-key: fix introspection

[Victor Toso <victortoso src gnome org>]

commit 7a89983f697566bc14225c480f8b1e8ffd041dd6
Author: Victor Toso <me victortoso com>
Date:   Wed Jul 17 09:58:48 2019 +0200

    grl-metadata-key: fix introspection
    
    The following commit has break gobject-introspection of Grilo after a
    comment with a line break was added to deprecate a constant:
    
        608eba2 "core: deprecate mb-album-id metadata-key and related
        API" in 2019-07-15 by Victor Toso <me victortoso com>
    
    The issue is being tracked at [0] but a simple workaround is to remove
    the line break.
    
    [0] https://gitlab.gnome.org/GNOME/gobject-introspection/issues/294
    
    Before this patch, grl-metadata-keys with value from 53 to 62 were
    lost in introspection, that is, from GRL_METADATA_KEY_MB_TRACK_ID till
    the recent GRL_METADATA_KEY_MB_RELEASE_GROUP_ID

 src/grl-metadata-key.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/src/grl-metadata-key.h b/src/grl-metadata-key.h
index 6ee7eaf..9d58031 100644
--- a/src/grl-metadata-key.h
+++ b/src/grl-metadata-key.h
@@ -116,8 +116,7 @@ typedef enum {
 #define GRL_METADATA_KEY_ORIGINAL_TITLE       49
 #define GRL_METADATA_KEY_SIZE                 50
 #define GRL_METADATA_KEY_TITLE_FROM_FILENAME  51
-#define GRL_METADATA_KEY_MB_ALBUM_ID          52 /* Deprecated: use GRL_METADATA_KEY_MB_RELEASE_ID
-                                                    or GRL_METADATA_KEY_MB_RELEASE_GROUP_ID */
+#define GRL_METADATA_KEY_MB_ALBUM_ID          52 /* Deprecated: use GRL_METADATA_KEY_MB_RELEASE_ID or 
GRL_METADATA_KEY_MB_RELEASE_GROUP_ID */
 #define GRL_METADATA_KEY_MB_TRACK_ID          53
 #define GRL_METADATA_KEY_MB_ARTIST_ID         54
 #define GRL_METADATA_KEY_MB_RECORDING_ID      55