cache.h: extract enum declaration from inside a struct declaration

While it is technically possible, it is confusing. Not only the user,
but also VS Code's intellisense.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -1362,8 +1362,7 @@ extern void *read_object_with_reference(const struct object_id *oid,
 extern struct object *peel_to_type(const char *name, int namelen,
 				   struct object *o, enum object_type);
 
-struct date_mode {
-	enum date_mode_type {
+enum date_mode_type {
 	DATE_NORMAL = 0,
 	DATE_RELATIVE,
 	DATE_SHORT,
@@ -1373,7 +1372,10 @@ struct date_mode {
 	DATE_STRFTIME,
 	DATE_RAW,
 	DATE_UNIX
-	} type;
+};
+
+struct date_mode {
+	enum date_mode_type type;
 	const char *strftime_fmt;
 	int local;
 };