Merge pull request #3838 from gudnimg/PFW-1458

PFW-1458 Reduce MMU loading test length

Firmware/mmu2.cpp

@@ -318,9 +318,9 @@ bool MMU2::VerifyFilamentEnteredPTFE()
     uint8_t fsensorState = 0;
     // MMU has finished its load, push the filament further by some defined constant length
     // If the filament sensor reads 0 at any moment, then report FAILURE
-    current_position[E_AXIS] += MMU2_EXTRUDER_PTFE_LENGTH + MMU2_EXTRUDER_HEATBREAK_LENGTH - logic.ExtraLoadDistance();
+    current_position[E_AXIS] += MMU2_EXTRUDER_PTFE_LENGTH - logic.ExtraLoadDistance();
     plan_buffer_line_curposXYZE(MMU2_LOAD_TO_NOZZLE_FEED_RATE);
-    current_position[E_AXIS] -= (MMU2_EXTRUDER_PTFE_LENGTH + MMU2_EXTRUDER_HEATBREAK_LENGTH - logic.ExtraLoadDistance());
+    current_position[E_AXIS] -= (MMU2_EXTRUDER_PTFE_LENGTH - logic.ExtraLoadDistance());
     plan_buffer_line_curposXYZE(MMU2_LOAD_TO_NOZZLE_FEED_RATE);
 
     while(blocks_queued())