examples/mqttc/Kconfig: Fix Kconfig style

Remove spaces from Kconfig file
diff --git a/examples/mqttc/Kconfig b/examples/mqttc/Kconfig
index 279378d..4d23e84 100644
--- a/examples/mqttc/Kconfig
+++ b/examples/mqttc/Kconfig
@@ -6,7 +6,7 @@
 config EXAMPLES_MQTTC
 	tristate "Enable MQTT-C Example"
 	default n
-  	depends on NETUTILS_MQTTC
+	depends on NETUTILS_MQTTC
 	---help---
 		Enable a simple MQTT-C publisher example