Super tiny code optimization: No need to redundantly check whether value has changed (#130050)

Removed two unnecessary `if` conditions.

packages/flutter/lib/src/widgets/text_selection.dart

@@ -3312,7 +3312,7 @@ class ClipboardStatusNotifier extends ValueNotifier<ClipboardStatus> with Widget
       ));
       // In the case of an error from the Clipboard API, set the value to
       // unknown so that it will try to update again later.
-      if (_disposed || value == ClipboardStatus.unknown) {
+      if (_disposed) {
         return;
       }
       value = ClipboardStatus.unknown;
@@ -3322,7 +3322,7 @@ class ClipboardStatusNotifier extends ValueNotifier<ClipboardStatus> with Widget
         ? ClipboardStatus.pasteable
         : ClipboardStatus.notPasteable;
 
-    if (_disposed || nextStatus == value) {
+    if (_disposed) {
       return;
     }
     value = nextStatus;