tests: Fix help test to reflect updated help output

Commit f5759a878 (normal/help: Add paging instructions to normal and help
prompts) changed the output of the help command, which broke the help
test. This change allows the test to pass.

On the occasion do s/outpu/output/.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

tests/help_test.in

@@ -8,9 +8,12 @@ Show a help message.
 
 -h, --help              Display this help and exit.
 -u, --usage             Display the usage of this command and exit.
-Hello World"
-outpu="$(echo 'help help; hello' | @builddir@/grub-shell)"
 
-if [ "$template" != "$outpu" ]; then
+
+To enable less(1)-like paging, \"set pager=1\".
+Hello World"
+output="$(echo 'help help; hello' | @builddir@/grub-shell)"
+
+if [ "$template" != "$output" ]; then
     exit 1
 fi