onedrive: fix quickxorhash on 32 bit architectures

Before this fix quickxorhash would sometimes crash with an error like
this:

    panic: runtime error: slice bounds out of range [-1248:]

This was caused by an incorrect cast of a 64 bit number to a 32 bit
one on 32 bit platforms.

See: https://forum.rclone.org/t/panic-runtime-error-slice-bounds-out-of-range/37548

backend/onedrive/quickxorhash/quickxorhash.go

@@ -61,7 +61,7 @@ func New() hash.Hash {
 func (q *quickXorHash) Write(p []byte) (n int, err error) {
 	var i int
 	// fill last remain
-	lastRemain := int(q.size) % dataSize
+	lastRemain := q.size % dataSize
 	if lastRemain != 0 {
 		i += xorBytes(q.data[lastRemain:], p)
 	}