Apply a upstream fix to libskk

Description:

Upstream json file contains an invalid escape string. The library used to parse this string seems to become stricter on the json file makes it fails to parse.

Additional info:

• package version(s): 1.0.5-2
• config and/or log files:
• link to upstream bug report, if any: https://github.com/ueno/libskk/issues/89
• Upstream fix: https://github.com/ueno/libskk/commit/a2936e865fcc00e6e0c0bfc6c1d62db19e49fe74

Steps to reproduce:

Input method relaying on libskk is not usable. Install fcitx5-skk and setup to use it.