Fix braino in merging the previous commit

There's a mantest that shows how to use `env`.  Well, we need to set the
env var as expected then, else it will fail.

tests/mantest

@@ -2,4 +2,6 @@
 
 . "${0%/*}/setup"
 
-(cd $JQBASEDIR/docs && rake mantests) | $VALGRIND $Q $JQ -L "$mods" --run-tests
+# We set PAGER because there's a mantest for `env` that uses it.
+(cd $JQBASEDIR/docs && rake mantests) |
+    env PAGER=less $VALGRIND $Q $JQ -L "$mods" --run-tests