Remove redundant Text#assignedSlot

Slottable already defines it.

Author: saschanaz

baselines/dom.generated.d.ts

@@ -13348,7 +13348,6 @@ declare var SubtleCrypto: {
 
 /** The textual content of Element or Attr. If an element has no markup within its content, it has a single child implementing Text that contains the element's text. However, if the element contains markup, it is parsed into information items and Text nodes that form its children. */
 interface Text extends CharacterData, Slottable {
-    readonly assignedSlot: HTMLSlotElement | null;
     /** Returns the combined data of all direct Text node siblings. */
     readonly wholeText: string;
     /** Splits data at the given offset and returns the remainder as Text node. */

inputfiles/addedTypes.jsonc

@@ -581,8 +581,7 @@
                             ]
                         }
                     }
-                },
-
+                }
             },
             "EventListenerObject": {
                 "name": "EventListenerObject",
@@ -595,7 +594,7 @@
                             ]
                         }
                     }
-                },
+                }
             },
             "Document": {
                 "methods": {
@@ -748,18 +747,6 @@
                     ]
                 }
             },
-            "Text": {
-                "name": "Text",
-                "properties": {
-                    "property": {
-                        "assignedSlot": {
-                            "name": "assignedSlot",
-                            "readonly": true,
-                            "overrideType": "HTMLSlotElement | null"
-                        }
-                    }
-                }
-            },
             "TextTrackList": {
                 "events": {
                     "event": [