refactor: move macro definiton outside of enums

Uncrustify version 0.75 assumes the macro inside the enum is an enum
element, and thus adds a comma after it. This breaks neovim and makes it
impossible to build it.

src/nvim/shada.c

@@ -151,8 +151,8 @@ typedef enum {
   kSDItemBufferList = 9,     ///< Buffer list.
   kSDItemLocalMark = 10,     ///< Buffer-local mark.
   kSDItemChange = 11,        ///< Item from buffer change list.
-#define SHADA_LAST_ENTRY ((uint64_t)kSDItemChange)
 } ShadaEntryType;
+#define SHADA_LAST_ENTRY ((uint64_t)kSDItemChange)
 
 /// Possible results when reading ShaDa file
 typedef enum {