samples: ccs811: fix nrf51_ble400.overlay whitespace

Use tabs.

Signed-off-by: Martí Bolívar <[email protected]>

Author: mbolivar-nordic

samples/sensor/ccs811/boards/nrf51_ble400.overlay

@@ -5,17 +5,17 @@
  */
 
 &i2c0 {
-        status = "okay";
-        sda-pin = <0>;
-        scl-pin = <1>;
+	status = "okay";
+	sda-pin = <0>;
+	scl-pin = <1>;
 
 	/* Sparkfun Environment Combo uses second I2C address */
-        ccs811: ccs811@5b {
-                compatible = "ams,ccs811";
-                reg = <0x5b>;
-                label = "CCS811";
-                irq-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
-                wake-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
-                reset-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
-        };
+	ccs811: ccs811@5b {
+		compatible = "ams,ccs811";
+		reg = <0x5b>;
+		label = "CCS811";
+		irq-gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
+		wake-gpios = <&gpio0 5 GPIO_ACTIVE_LOW>;
+		reset-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
+	};
 };