WireGuardApp: Switch WireGuardKit to master branch

Signed-off-by: Andrej Mihajlov <and@mullvad.net>

README.md

@@ -40,8 +40,6 @@ $ open ./WireGuard/WireGuard.xcodeproj
    https://git.zx2c4.com/wireguard-apple
    ```
    
-   Choose `am/swiftpm` branch in the "Rules" section.
-   
 2. `WireGuardKit` links against `wireguard-go-bridge` library, but it cannot build it automatically
    due to Swift package manager limitations. So it needs a little help from a developer. 
    Please follow the instructions below to create a build target(s) for `wireguard-go-bridge`.

WireGuard/WireGuard.xcodeproj/project.pbxproj

@@ -1746,7 +1746,7 @@
 			isa = XCRemoteSwiftPackageReference;
 			repositoryURL = "https://git.zx2c4.com/wireguard-apple";
 			requirement = {
-				branch = "am/wg-adapter-rebased";
+				branch = master;
 				kind = branch;
 			};
 		};

WireGuard/WireGuard.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -5,8 +5,8 @@
         "package": "WireGuardKit",
         "repositoryURL": "https://git.zx2c4.com/wireguard-apple",
         "state": {
-          "branch": "am/wg-adapter-rebased",
-          "revision": "ca605363c05cda61fbd21e031f3fb5eee7f259c8",
+          "branch": "master",
+          "revision": "737f847c0db36429f7136fb514409c22e13a70ee",
           "version": null
         }
       }