feat: Simplify OurDB.set function

- Remove unnecessary nested `if` statement in `OurDB.set`.
- Improve code readability and maintainability.

lib/data/ourdb/db.v

@@ -29,16 +29,14 @@ pub fn (mut db OurDB) set(args OurDBSetArgs) !u32 {
 		// if id points to an empty location, return an error
 		// else, overwrite data
 		if id := args.id {
-			if id != 0 {
-				// this is an update
-				location := db.lookup.get(id)!
-				if location.position == 0 {
-					return error('cannot set id for insertions when incremental mode is enabled')
-				}
-
-				db.set_(id, location, args.data)!
-				return id
+			// this is an update
+			location := db.lookup.get(id)!
+			if location.position == 0 {
+				return error('cannot set id for insertions when incremental mode is enabled')
 			}
+
+			db.set_(id, location, args.data)!
+			return id
 		}
 
 		// this is an insert