Fix DbContext configuration nightmares.

Thanks to julian figuring out IDesignTimeDbContextFactory exists in #6327.

All this DbContext configuration and options setup stuff is insane. Microsoft should be absolutely ashamed for coming up with this load of garbage.

Content.Tests/Server/Preferences/ServerDbSqliteTests.cs

@@ -67,7 +67,7 @@ namespace Content.Tests.Server.Preferences
 
         private static ServerDbSqlite GetDb()
         {
-            var builder = new DbContextOptionsBuilder<ServerDbContext>();
+            var builder = new DbContextOptionsBuilder<SqliteServerDbContext>();
             var conn = new SqliteConnection("Data Source=:memory:");
             conn.Open();
             builder.UseSqlite(conn);