Remove explicit paths from script wrapper

By default, scrcpy built with -Dportable=true will find scrcpy-server
and icon.png in the same directory as the executable.

app/data/scrcpy_static_wrapper.sh

@@ -1,6 +1,4 @@
 #!/bin/bash
 cd "$(dirname ${BASH_SOURCE[0]})"
 export ADB="${ADB:-./adb}"
-export SCRCPY_SERVER_PATH="${SCRCPY_SERVER_PATH:-./scrcpy-server}"
-export SCRCPY_ICON_PATH="${SCRCPY_ICON_PATH:-./icon.png}"
 ./scrcpy_bin "$@"