Fix "probing failed" false positives (#18435)

Marlin/src/module/probe.cpp

@@ -544,7 +544,7 @@ float Probe::run_z_probe(const bool sanity_check/*=true*/) {
 
     // Do a first probe at the fast speed
     if (try_to_probe(PSTR("FAST"), z_probe_low_point, MMM_TO_MMS(Z_PROBE_SPEED_FAST),
-                     sanity_check, _MAX(Z_CLEARANCE_BETWEEN_PROBES, 4) / 2) ) return NAN;
+                     sanity_check, Z_CLEARANCE_BETWEEN_PROBES) ) return NAN;
 
     const float first_probe_z = current_position.z;
 
@@ -582,7 +582,7 @@ float Probe::run_z_probe(const bool sanity_check/*=true*/) {
     {
       // Probe downward slowly to find the bed
       if (try_to_probe(PSTR("SLOW"), z_probe_low_point, MMM_TO_MMS(Z_PROBE_SPEED_SLOW),
-                       sanity_check, _MAX(Z_CLEARANCE_MULTI_PROBE, 4) / 2) ) return NAN;
+                       sanity_check, Z_CLEARANCE_MULTI_PROBE) ) return NAN;
 
       TERN_(MEASURE_BACKLASH_WHEN_PROBING, backlash.measure_with_probe());