Add missing private pointer for D6T-1A

Author: tyeth

src/components/i2c/WipperSnapper_I2C.h

@@ -149,6 +149,7 @@ class WipperSnapper_Component_I2C {
       _drivers_out; ///< List of i2c output drivers
   // Sensor driver objects
   WipperSnapper_I2C_Driver_AHTX0 *_ahtx0 = nullptr;
+  WipperSnapper_I2C_Driver_D6T1A *_d6t1a = nullptr;
   WipperSnapper_I2C_Driver_DPS310 *_dps310 = nullptr;
   WipperSnapper_I2C_Driver_DS2484 *_ds2484 = nullptr;
   WipperSnapper_I2C_Driver_ENS160 *_ens160 = nullptr;