lib-submodule-update: add space after function name

In the shell scripts in this codebase, the usual style is to include a
space between the function name and the (). Add these missing spaces to
conform to the usual style of the code.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-submodule-update.sh

@@ -183,7 +183,7 @@ test_git_directory_is_unchanged () {
 	)
 }
 
-test_git_directory_exists() {
+test_git_directory_exists () {
 	test -e ".git/modules/$1" &&
 	if test -f sub1/.git
 	then
@@ -309,7 +309,7 @@ test_submodule_content () {
 
 # Internal function; use test_submodule_switch() or
 # test_submodule_forced_switch() instead.
-test_submodule_switch_common() {
+test_submodule_switch_common () {
 	command="$1"
 	######################### Appearing submodule #########################
 	# Switching to a commit letting a submodule appear creates empty dir ...
@@ -629,7 +629,7 @@ test_submodule_forced_switch () {
 
 # Internal function; use test_submodule_switch_recursing_with_args() or
 # test_submodule_forced_switch_recursing_with_args() instead.
-test_submodule_recursing_with_args_common() {
+test_submodule_recursing_with_args_common () {
 	command="$1"
 
 	######################### Appearing submodule #########################