Config.in.legacy: fix separator comment location

When the fis and gadgetfs-test packages were removed, their respective
options in Config.in.legacy were placed before the "Legacy options
removed in 2020.02", while they should have been placed after. Let's
fix that.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Config.in.legacy

@@ -144,6 +144,8 @@ endif
 
 ###############################################################################
 
+comment "Legacy options removed in 2020.02"
+
 config BR2_PACKAGE_GADGETFS_TEST
 	bool "gadgetfs-test was removed"
 	select BR2_LEGACY
@@ -158,8 +160,6 @@ config BR2_PACKAGE_FIS
 	help
 	  The fis package was removed.
 
-comment "Legacy options removed in 2020.02"
-
 config BR2_PACKAGE_REFPOLICY_POLICY_VERSION
 	string "refpolicy policy version"
 	help