Apple: use xmark.circle for the "clear" icon

Looks better as the action in a text input field.

Pick-to: 6.7
Change-Id: I63fd9b963102919cf69f345723d1c5d83778f1f4
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Karolina Sofia Bang <karolina.bang@qt.io>

src/gui/platform/darwin/qappleiconengine.mm

@@ -41,7 +41,7 @@ auto *loadImage(const QString &iconName)
         {"document-save"_L1, @"square.and.arrow.down"},
         //{"document-save-as"_L1, @""},
         {"document-send"_L1, @"paperplane"},
-        {"edit-clear"_L1, @"clear"},
+        {"edit-clear"_L1, @"xmark.circle"},
         {"edit-copy"_L1, @"doc.on.doc"},
         {"edit-cut"_L1, @"scissors"},
         {"edit-delete"_L1, @"delete.left"},