doom-wad: enable kconfig entry for PrBoom package and fix whitespace damage

This patch will let the user install the Doom shareware WAD file if PrBoom is
selected.

Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>

package/games/doom-wad/Config.in

@@ -1,7 +1,7 @@
 config BR2_PACKAGE_DOOM_WAD
 	bool "shareware Doom WAD file"
-	depends on BR2_PACKAGE_LXDOOM
+	depends on BR2_PACKAGE_LXDOOM || BR2_PACKAGE_PRBOOM
 	help
-          This will install the shareware wad data file for the doom game.
+	  This will install the shareware wad data file for the doom game.
 
-          The wad file will be placed in the /usr/share/games/doom directory.
+	  The wad file will be placed in the /usr/share/games/doom directory.