zephyr: tabs to spaces in line indentation

Uses spaces instead of tabs.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
diff --git a/boot/zephyr/main.c b/boot/zephyr/main.c
index f4374e6..e2e609f 100644
--- a/boot/zephyr/main.c
+++ b/boot/zephyr/main.c
@@ -216,7 +216,7 @@
 #else
                             GPIO_DIR_IN | GPIO_PUD_PULL_UP
 #endif
-	    );
+           );
     __ASSERT(rc == 0, "Error of boot detect pin initialization.\n");
 
 #ifdef GPIO_INPUT