UI: macOS: remove donation link

Apple forbids us from having a simple donation link in the "About
WireGuard" dialog, due to new policies. And arguing with the giant is
not going to be a fruitful battle. Do the practical thing and just
remove it.

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

Sources/WireGuardApp/Config/Version.xcconfig

@@ -1,2 +1,2 @@
 VERSION_NAME = 1.0.10
-VERSION_ID = 18
+VERSION_ID = 19

Sources/WireGuardApp/UI/macOS/AppDelegate.swift

@@ -210,13 +210,11 @@ extension AppDelegate {
             tr(format: "macAppVersion (%@)", appVersion),
             tr(format: "macGoBackendVersion (%@)", WIREGUARD_GO_VERSION)
         ].joined(separator: "\n")
-        let donateString = NSMutableAttributedString(string: tr("donateLink"))
-        donateString.addAttribute(.link, value: "https://www.wireguard.com/donations/", range: NSRange(location: 0, length: donateString.length))
         NSApp.activate(ignoringOtherApps: true)
         NSApp.orderFrontStandardAboutPanel(options: [
             .applicationVersion: appVersionString,
             .version: "",
-            .credits: donateString
+            .credits: ""
         ])
     }
 }