Fix funcsave to not delete the function it just created

In 73f344f41b, we allowed autoloaded functions to be deleted.
For some reason, funcsave immediately deletes the function it
creates. This previously did very little, since the function would
immediately be re-autoloaded, but with the fix for 73f344f41b
the function gets tombstoned. So the effect is that funcsave
makes the function disappear! This simply removes the erase call,
which dates back to fish 1.x.

share/functions/funcsave.fish

@@ -32,7 +32,6 @@ function funcsave --description "Save the current definition of all specified fu
 	for i in $argv
 		if functions -q -- $i
 			functions -- $i > $configdir/fish/functions/$i.fish
-			functions -e -- $i
 		else
 			printf (_ "%s: Unknown function '%s'\n") funcsave $i
 			set res 1