[backport 1.25] Fix disconnection from subgraph inputs (#4859)

Co-authored-by: AustinMroz <austin@comfy.org>

src/lib/litegraph/src/canvas/LinkConnector.ts

@@ -795,7 +795,10 @@ export class LinkConnector {
    */
   disconnectLinks(): void {
     for (const link of this.renderLinks) {
-      if (link instanceof MovingLinkBase) {
+      if (
+        link instanceof MovingLinkBase ||
+        link instanceof ToInputFromIoNodeLink
+      ) {
         link.disconnect()
       }
     }

src/lib/litegraph/src/canvas/ToInputFromIoNodeLink.ts

@@ -135,4 +135,9 @@ export class ToInputFromIoNodeLink implements RenderLink {
   connectToRerouteOutput() {
     throw new Error('ToInputRenderLink cannot connect to an output.')
   }
+  disconnect(): boolean {
+    if (!this.existingLink) return false
+    this.existingLink.disconnect(this.network, 'input')
+    return true
+  }
 }