Update WipperSnapper_I2C_Driver_Out_Sh1107.h

Author: tyeth

src/components/i2c/drivers/WipperSnapper_I2C_Driver_Out_Sh1107.h

@@ -75,13 +75,13 @@ class WipperSnapper_I2C_Driver_Out_SH1107
     // Show image buffer on the display hardware.
     // Since the buffer is intialized with an Adafruit splashscreen
     // internally, this will display the splashscreen.
-    _display.display();
+    _display->display();
     delay(700);
 
     // Clear the buffer.
-    _display.clearDisplay();
-    _display.display();
-    _display.setRotation(1);
+    _display->clearDisplay();
+    _display->display();
+    _display->setRotation(1);
 
       // Configure the text size and color
     _display->setTextSize(_text_sz);