force_move: Use strings for axes to clear in clear_homing_state()

Pass a string such as "xyz" to kin.clear_homing_state().  This makes
the parameter a little less cryptic.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/kinematics/deltesian.py

@@ -116,10 +116,10 @@ class DeltesianKinematics:
         for axis_name in homing_axes:
             axis = "xyz".index(axis_name)
             self.homed_axis[axis] = True
-    def clear_homing_state(self, axes):
-        for i, _ in enumerate(self.limits):
-            if i in axes:
-                self.homed_axis[i] = False
+    def clear_homing_state(self, clear_axes):
+        for axis, axis_name in enumerate("xyz"):
+            if axis_name in clear_axes:
+                self.homed_axis[axis] = False
     def home(self, homing_state):
         homing_axes = homing_state.get_axes()
         home_xz = 0 in homing_axes or 2 in homing_axes