Remove unnecessary db search for scrobbles

I forgot I made scrobbles owned by their respective songs/albums/artists, so I can just query that instead

src/app/database/Schema.zig

@@ -115,7 +115,7 @@ pub const Scrobble = jetquery.Model(
     struct {
         id: i32,
         song_id: i32,
-        album_id: ?i32,
+        album_id: i32,
         date: jetquery.DateTime,
         created_at: jetquery.DateTime,
         updated_at: jetquery.DateTime,

src/app/database/migrations/2025-02-17_22-38-46_create_scrobbles.zig

@@ -8,7 +8,7 @@ pub fn up(repo: anytype) !void {
         &.{
             t.primaryKey("id", .{}),
             t.column("song_id", .integer, .{}),
-            t.column("album_id", .integer, .{ .optional = true }),
+            t.column("album_id", .integer, .{}),
             t.column("date", .datetime, .{}),
             t.timestamps(.{}),
         },