Qt/Input: use name_string instead of hard coded strings

hopefully prevents any more need for fixups like this lol
+ tend to some warnings for rebase

rpcs3/Emu/Io/PadHandler.cpp

@@ -248,6 +248,11 @@ std::tuple<u16, u16> PadHandlerBase::ConvertToSquirclePoint(u16 inX, u16 inY, in
 	return std::tuple<u16, u16>(newX, newY);
 }
 
+std::string PadHandlerBase::name_string()
+{
+	return m_name_string;
+}
+
 int PadHandlerBase::max_devices()
 {
 	return m_max_devices;