package/swupdate: fix typo in BR2_PACKAGE_LIBCURL in the help text

Config.in documented BR2_LIBCURL for swupdate but the actual
package name is BR2_PACKAGE_LIBCURL

Fix by updating the same in Config.in

Cc: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 5abe6f2bf7baaa5e3bffc2e6dae22a045a1265bb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/swupdate/Config.in

@@ -22,7 +22,7 @@ config BR2_PACKAGE_SWUPDATE
 
 	  * Select BR2_PACKAGE_LUA or BR2_PACKAGE_LUAJIT if you want
 	    want to have Lua support.
-	  * Select BR2_LIBCURL if you want to use the download
+	  * Select BR2_PACKAGE_LIBCURL if you want to use the download
 	    feature.
 	  * Select BR2_PACKAGE_OPENSSL is you want to add encryption
 	    support.