Refactor: remove unnecessary parameters (microsoft#558)

Co-authored-by: winter_wang <[email protected]>

Author: winterfx

internal/astnav/tokens.go

@@ -82,7 +82,7 @@ func getTokenAtPosition(
 	}
 
 	visitNodes := func(nodes []*ast.Node) {
-		index, match := core.BinarySearchUniqueFunc(nodes, position, func(middle int, node *ast.Node) int {
+		index, match := core.BinarySearchUniqueFunc(nodes, func(middle int, node *ast.Node) int {
 			cmp := testNode(node)
 			if cmp < 0 {
 				left = node.End()

internal/core/binarysearch.go

@@ -5,7 +5,7 @@ package core
 // in the slice could match the target. Also, unlike [slices.BinarySearchFunc],
 // the comparison function is passed the current index of the element being
 // compared, instead of the target element.
-func BinarySearchUniqueFunc[S ~[]E, E, T any](x S, target T, cmp func(int, E) int) (int, bool) {
+func BinarySearchUniqueFunc[S ~[]E, E any](x S, cmp func(int, E) int) (int, bool) {
 	n := len(x)
 	low, high := 0, n-1
 	for low <= high {