Issue title: BLTouch says "BLTouch failed to verify sensor state"
 Issue body: When I autohome/G28 with this printer.cfg:
```
# This file contains common pin mappings for the 2018 Creality
# Ender 3. To use this config, the firmware should be compiled for the
# AVR atmega1284p.

# Note, a number of Melzi boards are shipped with a bootloader that
# requires the following command to flash the board:
#  avrdude -p atmega1284p -c arduino -b 57600 -P /dev/ttyUSB0 -U out/klipper.elf.hex
# If the above command does not work and "make flash" does not work
# then one may need to flash a bootloader to the board - see the
# Klipper docs/Bootloaders.md file for more information.

# See the example.cfg file for a description of available parameters.

[stepper_x]
step_pin: PD7
dir_pin: !PC5
enable_pin: !PD6
step_distance: .0125
endstop_pin: ^PC2
position_endstop: 0
position_max: 235
homing_speed: 50

[stepper_y]
step_pin: PC6
dir_pin: !PC7
enable_pin: !PD6
step_distance: .0125
endstop_pin: ^PC3
position_endstop: 0
position_max: 235
homing_speed: 50

[stepper_z]
step_pin: PB3
dir_pin: PB2
enable_pin: !PA5
step_distance: .0025
endstop_pin: probe:z_virtual_endstop
position_endstop: 0.0
position_max: 250

[extruder]
max_extrude_only_distance: 100.0
step_pin: PB1
dir_pin: !PB0
enable_pin: !PD6
step_distance: 0.010526
nozzle_diameter: 0.400
filament_diameter: 1.750
heater_pin: PD5
sensor_type: EPCOS 100K B57560G104F
sensor_pin: PA7
control: pid
# tuned for stock hardware with 200 degree Celsius target
pid_Kp: 21.527
pid_Ki: 1.063
pid_Kd: 108.982
min_temp: 0
max_temp: 250

[heater_bed]
heater_pin: PD4
sensor_type: EPCOS 100K B57560G104F
sensor_pin: PA6
control: pid
# tuned for stock hardware with 50 degree Celsius target
pid_Kp: 54.027
pid_Ki: 0.770
pid_Kd: 948.182
min_temp: 0
max_temp: 130

[fan]
pin: PB4

[mcu]
serial: /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_A506VH68-if00-port0

[printer]
kinematics: cartesian
max_velocity: 300
max_accel: 3000
max_z_velocity: 5
max_z_accel: 100

[bltouch]
sensor_pin: ^PC4 ; P1.24
control_pin: PA4 ; P1.26
pin_up_reports_not_triggered: true
pin_move_time: 0.200
x_offset: -46
y_offset: -2
z_offset: 0
speed: 5

[homing_override]
gcode:
    G90 ; Use absolute position mode
    G1 Z10 ; Move up 10mm
    G28 X Y
    G1 X110 Y110 F6000 ; Change the X and Y coordinates to the center of your print bed
    G28 Z
set_position_z: 0.0

[display]
lcd_type: st7920
cs_pin: PA3
sclk_pin: PA1
sid_pin: PC1
encoder_pins: ^PD2, ^PD3
click_pin: ^!PC0
```
I get the errors:
```
Recv: !! BLTouch failed to verify sensor state
Recv: !! BLTouch failed to verify sensor state
```
[klippy.log](https://github.com/KevinOConnor/klipper/files/3175007/klippy.log)
Thanks in advantage!

 Comments: 
 Comment 0: ```
pin_up_touch_mode_reports_triggered: False
```
did it
{'source': 'GithubIssues', 'repo_name_with_owner': 'KevinOConnor/klipper', 'issue_id': 443622341, 'repo_stars': 3664.0}