fix wismesh tag power off and wake up

variants/rak_wismesh_tag/RAKWismeshTagBoard.h

@@ -62,7 +62,8 @@ public:
     digitalWrite(LED_PIN, HIGH);
     #endif
     #ifdef BUTTON_PIN
-    while(digitalRead(BUTTON_PIN));
+    // wismesh tag uses LOW to indicate button is pressed, wait until it goes HIGH to indicate it was released
+    while(digitalRead(BUTTON_PIN) == LOW);
     #endif
     #ifdef LED_GREEN
     digitalWrite(LED_GREEN, LOW);
@@ -72,7 +73,8 @@ public:
     #endif
 
     #ifdef BUTTON_PIN
-    nrf_gpio_cfg_sense_input(digitalPinToInterrupt(BUTTON_PIN), NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_HIGH);
+    // configure button press to wake up when in powered off state
+    nrf_gpio_cfg_sense_input(digitalPinToInterrupt(BUTTON_PIN), NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);
     #endif
 
     sd_power_system_off();