Partially revert c42889ceef

Pretty sure it's impossible for this to be null; the entry assembly always has a location and only weird dynamic assemblies can have none.

But if somehow it was, then we don't want to create a jumplist item that doesn't work!

src/BizHawk.Client.EmuHawk/JumpLists.cs

@@ -41,9 +41,7 @@ namespace BizHawk.Client.EmuHawk
 		{
 			try
 			{
-				string execPath = Assembly.GetEntryAssembly()
-					?.Location;
-
+				string execPath = Assembly.GetEntryAssembly().Location;
 				dynamic ji = Activator.CreateInstance(JumpTask);
 
 				ji.ApplicationPath = execPath;