clean up call button appearance logic

Session/Conversations/ConversationVC+Interaction.swift

@@ -29,11 +29,7 @@ extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuAc
     // MARK: Call
     @objc func startCall(_ sender: Any?) {
         guard SessionCall.isEnabled else { return }
-        let userDefaults = UserDefaults.standard
-        if !SSKPreferences.areCallsEnabled && !userDefaults[.hasSeenCallIPExposureWarning] {
-            userDefaults[.hasSeenCallIPExposureWarning] = true
-            showCallModal()
-        } else if SSKPreferences.areCallsEnabled {
+        if SSKPreferences.areCallsEnabled {
             requestMicrophonePermissionIfNeeded { }
             guard AVAudioSession.sharedInstance().recordPermission == .granted else { return }
             guard let contactSessionID = (thread as? TSContactThread)?.contactSessionID() else { return }
@@ -47,13 +43,6 @@ extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuAc
         }
     }
     
-    internal func showCallModal() {
-        let callModal = CallModal() { [weak self] in
-            self?.startCall(nil)
-        }
-        present(callModal, animated: true, completion: nil)
-    }
-    
     internal func showCallVCIfNeeded() {
         guard let incomingCallBanner = IncomingCallBanner.current else { return }
         incomingCallBanner.showCallVC(answer: false)

Session/Conversations/ConversationVC.swift

@@ -309,7 +309,7 @@ final class ConversationVC : BaseVC, ConversationViewModelDelegate, OWSConversat
                 settingsButton.accessibilityLabel = "Settings button"
                 settingsButton.isAccessibilityElement = true
                 rightBarButtonItems.append(settingsButton)
-                let shouldShowCallButton = SessionCall.isEnabled && !thread.isNoteToSelf() && (SSKPreferences.areCallsEnabled || !UserDefaults.standard[.hasSeenCallIPExposureWarning])
+                let shouldShowCallButton = SessionCall.isEnabled && !thread.isNoteToSelf() && SSKPreferences.areCallsEnabled
                 if shouldShowCallButton {
                     let callButton = UIBarButtonItem(image: UIImage(named: "Phone")!, style: .plain, target: self, action: #selector(startCall))
                     rightBarButtonItems.append(callButton)