fix some build command

Author: rustdesk

flutter/build_ios.sh

@@ -4,4 +4,5 @@
 # no obfuscate, because no easy to check errors
 cd $(dirname $(dirname $(which flutter)))
 git apply ~/rustdesk/.github/patches/flutter_3.24.4_dropdown_menu_enableFilter.diff
+cd -
 flutter build ipa --release

flutter/ios_arm64.sh

@@ -1,4 +1,2 @@
 #!/usr/bin/env bash
-cd $(dirname $(dirname $(which flutter)))
-git apply ~/rustdesk/.github/patches/flutter_3.24.4_dropdown_menu_enableFilter.diff
 cargo build --features flutter,hwcodec --release --target aarch64-apple-ios --lib