schematic: mark R19 as dot no place

R19 pulls VCC_PHONE low for better power on detection.
but the voltage divider R20 + R21 also pull this line low using
a stronger pull down resistor ok 20 kOhm.
thus R19 is unnecessary-

this change has been tested with a real simtrace device.
trace and card emulation worked with a Nokia 3310.

Change-Id: I0dd2025a8634f0ec38060cfbaae68618a4198fca

hardware/kicad/SIMtrace.sch

@@ -321,6 +321,8 @@ F 0 "R19" H 9300 6100 50  0000 C CNN
 F 1 "100K" H 9300 6000 50  0000 C CNN
 F 2 "SM0603" H 9450 6000 60  0001 C CNN
 F 3 "" H 9450 6000 60  0001 C CNN
+F 4 "DNP" H 9300 5900 50  0000 C CNN "Place"
+F 5 "R20 and R21 already pull VCC_PHONE low" H 9450 6000 50  0001 C CNN "Note"
 	1    9450 6000
 	1    0    0    -1  
 $EndComp