fix(api): remove homing patch fix for right mount when a 96-channel is attached (#14975)

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# Overview
We now [unconditionally home the
axis](#14955) before
performing the homing move so we can now remove this patch. If we leave
this in, the head R is going to raise an error when the robot boots up
the first time because it will not be able to update the position
estimation.
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Author: ahiuchingau

api/src/opentrons/hardware_control/ot3api.py

@@ -1521,14 +1521,8 @@ async def _home_axis(self, axis: Axis) -> None:
         # G, Q should be handled in the backend through `self._home()`
         assert axis not in [Axis.G, Axis.Q]
 
-        # TODO(CM): This is a temporary fix in response to the right mount causing
-        # errors while trying to home on startup or attachment. We should remove this
-        # when we fix this issue in the firmware.
-        enable_right_mount_on_startup = (
-            self._gantry_load == GantryLoad.HIGH_THROUGHPUT and axis == Axis.Z_R
-        )
         encoder_ok = self._backend.check_encoder_status([axis])
-        if encoder_ok or enable_right_mount_on_startup:
+        if encoder_ok:
             # enable motor (if needed) and update estimation
             await self._enable_before_update_estimation(axis)