fix bsnescore and snes9x rompath usage (matches behavior before, maybe this should be changed but should be slightly more sensible now); remove unused imports

Author: CasualPokePlayer

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -34,8 +34,6 @@
 using BizHawk.Emulation.Cores.Nintendo.NES;
 using BizHawk.Emulation.Cores.Nintendo.SNES;
 
-using BizHawk.Emulation.DiscSystem;
-
 using BizHawk.Client.EmuHawk.ToolExtensions;
 using BizHawk.Client.EmuHawk.CoreExtensions;
 using BizHawk.Client.EmuHawk.CustomControls;

src/BizHawk.Client.EmuHawk/RetroAchievements/RCheevos.Debug.cs

@@ -7,7 +7,6 @@
 using BizHawk.Client.Common;
 using BizHawk.Common;
 using BizHawk.Common.PathExtensions;
-using BizHawk.Common.StringExtensions;
 using BizHawk.Emulation.Common;
 using BizHawk.Emulation.Cores.Arcades.MAME;
 using BizHawk.Emulation.DiscSystem;

src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.cs

@@ -25,7 +25,7 @@ public BsnesCore(CoreLoadParameters<SnesSettings, SnesSyncSettings> loadParamete
 			var ser = new BasicServiceProvider(this);
 			ServiceProvider = ser;
 
-			this._romPath = Path.ChangeExtension(loadParameters.Roms[0].RomPath.SubstringAfter('|'), null);
+			this._romPath = Path.ChangeExtension(loadParameters.Roms[0].RomPath.SubstringBefore('|'), null);
 			CoreComm = loadParameters.Comm;
 			_syncSettings = loadParameters.SyncSettings ?? new SnesSyncSettings();
 			SystemId = loadParameters.Game.System;

src/BizHawk.Emulation.Cores/Consoles/Nintendo/SNES9X/Snes9x.cs

@@ -30,7 +30,7 @@ public Snes9x(CoreLoadParameters<Settings, SyncSettings> loadParameters)
 				SystemId = VSystemID.Raw.SNES,
 			})
 		{
-			this._romPath = Path.ChangeExtension(loadParameters.Roms[0].RomPath.SubstringAfter('|'), null);
+			this._romPath = Path.ChangeExtension(loadParameters.Roms[0].RomPath.SubstringBefore('|'), null);
 			this._currentMsuTrack = new ProxiedFile();
 
 			LibSnes9x.OpenAudio openAudioCb = MsuOpenAudio;