config: clean double whitespace in Config-build.in

Trivial cosmetic cleanup. This also helps for script that parse for
options in Config files.

Signed-off-by: Paul Spooren <mail@aparcar.org>
Reviewed-by: Petr Štetiar <ynezz@true.cz>

config/Config-build.in

@@ -282,11 +282,11 @@ menu "Global build settings"
 			bool "Strong"
 	endchoice
 
-	config  KERNEL_STACKPROTECTOR
+	config KERNEL_STACKPROTECTOR
 		bool
 		default KERNEL_CC_STACKPROTECTOR_REGULAR || KERNEL_CC_STACKPROTECTOR_STRONG
 
-	config  KERNEL_STACKPROTECTOR_STRONG
+	config KERNEL_STACKPROTECTOR_STRONG
 		bool
 		default KERNEL_CC_STACKPROTECTOR_STRONG