tmc5160: Increase maximum current error check

It's possible to build and configure tmc5160 drivers with external
mosfets that support more than 3 amps.  The actual maximum for tmc5160
drivers is dependent on how the board is wired and the mosfets used.
Increase the error check to 10 amps.  This error checking is primarily
intended to catch "obvious misconfigurations" (eg, specifying
milli-amps instead of amps), and the new value of 10 amps should
suffice for this task.

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

klippy/extras/tmc5160.py

@@ -257,7 +257,7 @@
 ######################################################################
 
 VREF = 0.325
-MAX_CURRENT = 3.000
+MAX_CURRENT = 10.000 # Maximum dependent on board, but 10 is safe sanity check
 
 class TMC5160CurrentHelper:
     def __init__(self, config, mcu_tmc):