nes-fix a pretty big systematic error that wouldve made lots of savefiles not get generated

BizHawk.Emulation/Consoles/Nintendo/NES/BoardSystem.cs

@@ -166,7 +166,15 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 				}
 			}
 
-			public virtual byte[] SaveRam { get { return null; } }
+			public virtual byte[] SaveRam
+			{
+				get
+				{
+					if (!Cart.wram_battery) return null;
+					return WRAM;
+				}
+			}
+
 			public byte[] WRAM { get { return wram; } set { wram = value; } }
 			public byte[] VRAM { get { return vram; } set { vram = value; } }
 			public byte[] ROM { get; set; }
@@ -191,6 +199,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 				Assert(false, "unhandled {0} size of {1}", name,value);
 			}
 			protected void AssertBattery(bool has_bat) { Assert(Cart.wram_battery == has_bat); }
+
 		}
 
 		//this will be used to track classes that implement boards

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/SxROM.cs

@@ -257,15 +257,6 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 				WRAM[addr & wram_mask] = value;
 		}
 
-		public override byte[] SaveRam
-		{
-			get
-			{
-				if (!Cart.wram_battery) return null;
-				return WRAM;
-			}
-		}
-
 		public override void SyncState(Serializer ser)
 		{
 			base.SyncState(ser);