optimisation: compare uint16_t against uint16_t

AxisDistance returns uint16_t type and is currently compared with long double axis length. The axis lengths fit easily into uint16_t:

selectorLimits.lenght = 75
idlerLimits.lenght = 225

Change in memory:
Flash: -122 bytes
SRAM: 0 bytes

Author: gudnimg

src/modules/idler.cpp

@@ -39,7 +39,7 @@ void Idler::PlanHomingMoveBack() {
 bool Idler::FinishHomingAndPlanMoveToParkPos() {
     // check the axis' length
     if (AxisDistance(mm::axisUnitToTruncatedUnit<config::U_deg>(mm::motion.CurPosition<mm::Idler>()))
-        < (config::idlerLimits.lenght.v - 10)) { //@@TODO is 10 degrees ok?
+        < uint16_t(config::idlerLimits.lenght.v - 10)) { //@@TODO is 10 degrees ok?
         return false; // we couldn't home correctly, we cannot set the Idler's position
     }
 

src/modules/selector.cpp

@@ -35,7 +35,7 @@ void Selector::PlanHomingMoveBack() {
 
 bool Selector::FinishHomingAndPlanMoveToParkPos() {
     // check the axis' length
-    if (AxisDistance(mm::axisUnitToTruncatedUnit<config::U_mm>(mm::motion.CurPosition<mm::Selector>())) < (config::selectorLimits.lenght.v - 3)) { //@@TODO is 3mm ok?
+    if (AxisDistance(mm::axisUnitToTruncatedUnit<config::U_mm>(mm::motion.CurPosition<mm::Selector>())) < uint16_t(config::selectorLimits.lenght.v - 3)) { //@@TODO is 3mm ok?
         return false; // we couldn't home correctly, we cannot set the Selector's position
     }