Update submodule update opts init as per code review

Update the `GIT_SUBMODULE_UPDATE_OPTIONS_INIT` definition with the
correct values after removing `clone_checkout_strategy` in
`git_submodule_update_options`.

include/git2/submodule.h

@@ -157,7 +157,7 @@ typedef struct git_submodule_update_options {
 #define GIT_SUBMODULE_UPDATE_OPTIONS_INIT \
 	{ GIT_SUBMODULE_UPDATE_OPTIONS_VERSION, \
 		{ GIT_CHECKOUT_OPTIONS_VERSION, GIT_CHECKOUT_SAFE }, \
-	GIT_FETCH_OPTIONS_INIT, GIT_CHECKOUT_SAFE }
+	GIT_FETCH_OPTIONS_INIT, 1 }
 
 /**
  * Initializes a `git_submodule_update_options` with default values.