gopls/internal/golang: fix broken build due to semantic merge conflict

Update Cursor.Ancestors()->Cursor.Parent().Enclosing(). CL 660775
renamed Ancestors to Enclosing and made it reflexive. The additional
call to Parent leaves the logic equivalent.

Change-Id: I792ac981ae3191f6bc26696c50f5990434e39d15
Reviewed-on: https://go-review.googlesource.com/c/tools/+/665635
Auto-Submit: Robert Findley <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Michael Pratt <[email protected]>

Author: findleyr

gopls/internal/golang/extract.go

@@ -2045,7 +2045,7 @@ nextBranch:
 				(*ast.SelectStmt)(nil),
 			}
 			// Find innermost relevant ancestor for break/continue.
-			for curAncestor := range curBr.Ancestors(filter...) {
+			for curAncestor := range curBr.Parent().Enclosing(filter...) {
 				if l, ok := curAncestor.Parent().Node().(*ast.LabeledStmt); ok &&
 					label != nil &&
 					l.Label.Name == label.Name() {