Add max dim x value in yat4tango dynamic spectrum creation (TANGODEVIC-1696)

src/PulseCountingManagerBuffered.cpp

@@ -950,6 +950,7 @@ void PulseCountingManagerBuffered::manage_specific_dyn_attr()
 		dai.tai.disp_level = Tango::OPERATOR;
 		dai.tai.description = attrDescription;
         dai.tai.unit = p_cfg.pos_unitStr;
+		dai.tai.max_dim_x = LONG_MAX;
 		dai.rcb = yat4tango::DynamicAttributeReadCallback::instanciate(*this, 
 			&PulseCountingManagerBuffered::read_counter);
 		dai.set_user_data(l_id);