Wrap some macros

Marlin/src/gcode/bedlevel/G26.cpp

 
   if (parser.seenval('H')) {
     g26_hotend_temp = parser.value_celsius();
-    if (!WITHIN(g26_hotend_temp, 165, (HEATER_0_MAXTEMP - HOTEND_OVERSHOOT))) {
+    if (!WITHIN(g26_hotend_temp, 165, (HEATER_0_MAXTEMP) - (HOTEND_OVERSHOOT))) {
       SERIAL_ECHOLNPGM("?Specified nozzle temperature not plausible.");
       return;
     }

Marlin/src/gcode/lcd/M145.cpp

     int v;
     if (parser.seenval('H')) {
       v = parser.value_int();
-      ui.preheat_hotend_temp[material] = constrain(v, EXTRUDE_MINTEMP, HEATER_0_MAXTEMP - HOTEND_OVERSHOOT);
+      ui.preheat_hotend_temp[material] = constrain(v, EXTRUDE_MINTEMP, (HEATER_0_MAXTEMP) - (HOTEND_OVERSHOOT));
     }
     if (parser.seenval('F')) {
       v = parser.value_int();