Revert version bump in 4e2a49f commit:

feodor · feodor · commit 063ca03cf40f · 2020-10-13T11:09:13.000+03:00
that is only on-disk format version, not an API
diff --git a/src/rum.h b/src/rum.h
@@ -103,7 +103,7 @@ typedef struct RumMetaPageData
 	int64		nEntries;
 }	RumMetaPageData;
 
-#define RUM_CURRENT_VERSION		(0xC0DE0003)
+#define RUM_CURRENT_VERSION		(0xC0DE0002)
 
 #define RumPageGetMeta(p) \
 	((RumMetaPageData *) PageGetContents(p))
