Bug 1716439 - Set selection/textcontrols/selectionchange.tentative.html as passing on Windows opt

Latest synchronization of web-platform-tests with upstream repository had set it
as failing on Windows opt (and intermittent on some other platforms).

testing/web-platform/meta/selection/textcontrols/selectionchange.tentative.html.ini

@@ -4,7 +4,6 @@
       if not debug and (os == "linux") and not webrender and not fission: ["PASS", "FAIL"]
       if not debug and (os == "linux") and webrender and fission: ["PASS", "FAIL"]
       if not debug and (os == "linux") and webrender and not fission: ["PASS", "FAIL"]
-      if not debug and (os == "win"): FAIL
       if not debug and (os == "android"): ["PASS", "FAIL"]
 
   [Calling setRangeText() on empty the textarea element]
@@ -12,6 +11,5 @@
       if not debug and (os == "linux") and webrender and fission: ["PASS", "FAIL"]
       if not debug and (os == "linux") and webrender and not fission: ["PASS", "FAIL"]
       if not debug and (os == "linux") and not webrender and not fission: ["PASS", "FAIL"]
-      if not debug and (os == "win"): FAIL
       if not debug and (os == "android"): ["PASS", "FAIL"]