Remove FS304 class, fix Mapper162 with UNIF

FS304 is the same mapper as Mapper162, although it appears to be an earlier attempt at implementing it, with it being less complete than Mapper162 (and not even having savestate code implemented). It even having the same UNIF mapper string used seems to also make it so there's some "randomness" in terms of which class gets used for a UNIF ROM of this mapper (in my experience, 2.10 resulted in Mapper162 being used, while my own dev builds resulted in FS304 being used). UNIF configuration from FS304 is needed for it to be functional in Mapper162 however, so that was ported over.

Author: CasualPokePlayer

src/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/FS304.cs

@@ -12,7 +12,13 @@ public override bool Configure(EDetectionOrigin origin)
 			switch (Cart.BoardType)
 			{
 				case "MAPPER162":
+					break;
 				case "UNIF_UNL-FS304":
+					AssertChr(0);
+					AssertPrg(512, 1024, 2048, 4096);
+					Cart.VramSize = 8;
+					Cart.WramSize = 8;
+					Cart.WramBattery = true;
 					break;
 				default:
 					return false;