GitRemoteSettings: Pass the correct context

The scaffold doesn't exist in that context :(

lib/screens/settings_git_remote.dart

@@ -45,14 +45,18 @@ class _GitRemoteSettingsScreenState extends State<GitRemoteSettingsScreen> {
         PublicKeyWidget(publicKey),
         const SizedBox(height: 16.0),
         const Divider(),
-        Button(
+        Builder(
+          builder: (BuildContext context) => Button(
             text: "Copy Key",
             onPressed: () => _copyKeyToClipboard(context),
           ),
-        Button(
+        ),
+        Builder(
+          builder: (BuildContext context) => Button(
             text: "Regenerate Key",
             onPressed: () => _generateSshKey(context),
           ),
+        ),
         ListPreference(
           title: "Sync Frequency",
           currentOption: settings.remoteSyncFrequency.toPublicString(),