Revert "Guarantee that an autorun is not rerun if it is disposed (microsoft#188920)"

This reverts commit 96ebd36.

Author: hediet

src/vs/base/common/observableImpl/autorun.ts

@@ -118,7 +118,7 @@ export class AutorunObserver<TChangeSummary = any> implements IObserver, IReader
 	}
 
 	private _runIfNeeded() {
-		if (this.state === AutorunState.upToDate || this.disposed) {
+		if (this.state === AutorunState.upToDate) {
 			return;
 		}