mv: remove BOTH from enum update_mode

Since BOTH is not used anywhere in the code and its meaning is unclear,
remove it.

Helped-by: Derrick Stolee <[email protected]>
Helped-by: Victoria Dye <[email protected]>
Signed-off-by: Shaoxuan Yuan <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ffyuanda

builtin/mv.c

@@ -21,7 +21,6 @@ static const char * const builtin_mv_usage[] = {
 };
 
 enum update_mode {
-	BOTH = 0,
 	WORKING_DIRECTORY = (1 << 1),
 	INDEX = (1 << 2),
 	SPARSE = (1 << 3),