use renamed decrypt event method

src/components/structures/FilePanel.js

@@ -51,7 +51,7 @@ class FilePanel extends React.Component {
         if (toStartOfTimeline || !data || !data.liveEvent || ev.isRedacted()) return;
 
         const client = MatrixClientPeg.get();
-        client.decryptEvent(ev);
+        client.decryptEventIfNeeded(ev);
 
         if (ev.isBeingDecrypted()) {
             this.decryptingEvents.add(ev.getId());

src/components/structures/TimelinePanel.js

@@ -1149,10 +1149,8 @@ class TimelinePanel extends React.Component {
         arrayFastClone(events)
             .reverse()
             .forEach(event => {
-                if (event.shouldAttemptDecryption()) {
-                    const client = MatrixClientPeg.get();
-                    client.decryptEvent(event);
-                }
+                const client = MatrixClientPeg.get();
+                client.decryptEventIfNeeded(event);
             });
 
         const firstVisibleEventIndex = this._checkForPreJoinUISI(events);

src/components/views/messages/MessageActionBar.js

@@ -124,10 +124,8 @@ export default class MessageActionBar extends React.PureComponent {
             this.props.mxEvent.on("Event.status", this.onSent);
         }
 
-        if (this.props.mxEvent.shouldAttemptDecryption()) {
-            const client = MatrixClientPeg.get();
-            client.decryptEvent(this.props.mxEvent);
-        }
+        const client = MatrixClientPeg.get();
+        client.decryptEventIfNeeded(this.props.mxEvent);
 
         if (this.props.mxEvent.isBeingDecrypted()) {
             this.props.mxEvent.once("Event.decrypted", this.onDecrypted);

src/components/views/messages/ViewSourceEvent.js

@@ -39,9 +39,7 @@ export default class ViewSourceEvent extends React.PureComponent {
         const {mxEvent} = this.props;
 
         const client = MatrixClientPeg.get();
-        if (mxEvent.shouldAttemptDecryption()) {
-            client.decryptEvent(mxEvent);
-        }
+        client.decryptEventIfNeeded(mxEvent);
 
         if (mxEvent.isBeingDecrypted()) {
             mxEvent.once("Event.decrypted", () => this.forceUpdate());