Headless: Dispose of inputmanager in a catch-all try

src/Ryujinx/Headless/HeadlessRyujinx.cs

@@ -301,7 +301,10 @@ namespace Ryujinx.Headless
                 _userChannelPersistence.ShouldRestart = false;
             }
 
+            try
+            {
                 _inputManager.Dispose();
+            } catch {}
 
             return;