Don't show the invite nag bar when peeking

src/components/structures/RoomView.js

@@ -1595,6 +1595,7 @@ module.exports = React.createClass({
                 atEndOfLiveTimeline={this.state.atEndOfLiveTimeline}
                 sentMessageAndIsAlone={this.state.isAlone}
                 hasActiveCall={inCall}
+                isPeeking={myMembership !== "join"}
                 onInviteClick={this.onInviteButtonClick}
                 onStopWarningClick={this.onStopAloneWarningClick}
                 onScrollToBottomClick={this.jumpToLiveTimeline}