fruity: Fix TcpTunnelConnection teardown logic

Where it turns out IOStream.close_async() may throw other errors than
just IOError. This is a bug in gio-2.0.vapi, but still, once fixed there
we still want to catch (and ignore) all errors.

Kudos to @mrmacete for helping track this one down.

src/fruity/xpc.vala

@@ -2001,7 +2001,7 @@ namespace Frida.Fruity {
 
 			try {
 				yield connection.close_async ();
-			} catch (IOError e) {
+			} catch (GLib.Error e) {
 			}
 
 			close_request.resolve (true);