fix type errors, remove old duplicate

Author: GamerGirlandCo

src/typings/obsidian-ex.d.ts

@@ -4,6 +4,9 @@ import "obsidian";
 
 /** @hidden */
 declare module "obsidian" {
+    export interface View extends Component {
+        getState(): any;
+    }
     interface WorkspaceLeaf {
         serialize(): {
             id: string;
@@ -16,10 +19,11 @@ declare module "obsidian" {
         tabHeaderEl: HTMLElement;
         tabHeaderInnerTitleEl: HTMLElement;
     }
-    interface ItemView {
+    export interface ItemView {
         titleEl: HTMLElement;
         getState(): any;
     }
+
     interface FileManager {
         linkUpdaters: {
             canvas: {