Simplify logging tags

This was roop's initial idea, and it turns out to be the better one, now
that we can pass cstrings more easily.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

WireGuard/WireGuard/UI/iOS/AppDelegate.swift

@@ -12,7 +12,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     func application(_ application: UIApplication,
                      willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
-        Logger.configureGlobal(withFilePath: FileManager.appLogFileURL?.path, withTag: "APP")
+        Logger.configureGlobal(withFilePath: FileManager.appLogFileURL?.path)
 
         let window = UIWindow(frame: UIScreen.main.bounds)
         window.backgroundColor = UIColor.white

WireGuard/WireGuard/UI/iOS/Settings/SettingsTableViewController.swift

@@ -119,7 +119,7 @@ class SettingsTableViewController: UITableViewController {
                 return
             }
 
-            let isWritten = Logger.global?.writeLog(mergedWith: networkExtensionLogFilePath, to: destinationURL.path) ?? false
+            let isWritten = Logger.global?.writeLog(called: "APP", mergedWith: networkExtensionLogFilePath, called: "NET", to: destinationURL.path) ?? false
             guard isWritten else {
                 ErrorPresenter.showErrorAlert(title: "Log export failed", message: "Unable to write logs to file", from: self)
                 return