don't continue to play uri if user cancels purchase

ui/modal/modalAffirmPurchase/index.js

@@ -1,20 +1,18 @@
 import { connect } from 'react-redux';
-import { doPlayUri } from 'redux/actions/content';
+import { doPlayUri, doSetPlayingUri } from 'redux/actions/content';
+import { selectPlayingUri } from 'redux/selectors/content';
 import { doHideModal, doAnaltyicsPurchaseEvent } from 'redux/actions/app';
 import { makeSelectMetadataForUri } from 'lbry-redux';
 import ModalAffirmPurchase from './view';
 
 const select = (state, props) => ({
   metadata: makeSelectMetadataForUri(props.uri)(state),
+  playingUri: selectPlayingUri(state),
 });
 
 const perform = dispatch => ({
   analyticsPurchaseEvent: fileInfo => dispatch(doAnaltyicsPurchaseEvent(fileInfo)),
-  cancelPurchase: () => {
-    // TODO: Find a way to add this back without messing up embeds
-    // dispatch(doSetPlayingUri(null));
-    dispatch(doHideModal());
-  },
+  setPlayingUri: uri => dispatch(doSetPlayingUri(uri)),
   closeModal: () => dispatch(doHideModal()),
   loadVideo: (uri, onSuccess) => dispatch(doPlayUri(uri, true, undefined, onSuccess)),
 });

ui/modal/modalAffirmPurchase/view.jsx

@@ -17,16 +17,19 @@ type Props = {
   cancelPurchase: () => void,
   metadata: StreamMetadata,
   analyticsPurchaseEvent: GetResponse => void,
+  playingUri: ?string,
+  setPlayingUri: (?string) => void,
 };
 
 function ModalAffirmPurchase(props: Props) {
   const {
-    cancelPurchase,
     closeModal,
     loadVideo,
     metadata: { title },
     uri,
     analyticsPurchaseEvent,
+    playingUri,
+    setPlayingUri,
   } = props;
   const [success, setSuccess] = React.useState(false);
   const [purchasing, setPurchasing] = React.useState(false);
@@ -42,6 +45,14 @@ function ModalAffirmPurchase(props: Props) {
     });
   }
 
+  function cancelPurchase() {
+    if (uri === playingUri) {
+      setPlayingUri(null);
+    }
+
+    closeModal();
+  }
+
   React.useEffect(() => {
     let timeout;
     if (success) {