Fix kle converter mimetype

[zvecr]

Description

https://qmk.fm/converter/ is currently failing, producing a 500.

Attempting to reproduce this locally shows:

  File "qmk_api/web.py", line 298, in POST_v1_converters_kle
    response.mimetype = app.config['JSONIFY_MIMETYPE']
                        ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
KeyError: 'JSONIFY_MIMETYPE'

https://flask.palletsprojects.com/en/stable/config/

Changed in version 2.3: JSON_AS_ASCII, JSON_SORT_KEYS, JSONIFY_MIMETYPE, and JSONIFY_PRETTYPRINT_REGULAR were removed. The default app.json provider has equivalent attributes instead.

After this change:

curl -H "Content-Type: application/json" -X POST -d '{"raw":"[\"Num Lock\",\"/\",\"*\",\"-\"],\n[\"7\\nHome\",\"8\\n↑\",\"9\\nPgUp\",{h:2},\"+\"],\n[\"4\\n←\",\"5\",\"6\\n→\"],\n[\"1\\nEnd\",\"2\\n↓\",\"3\\nPgDn\",{h:2},\"Enter\"],\n[{w:2},\"0\\nIns\",\".\\nDel\"]\n"}' http://localhost:5001/v1/converters/kle

Now produces the expected:

{
    "keyboard_name": "", 
    "url": "", 
    "maintainer": "qmk", 
    "layouts": {
        "LAYOUT": {
            "layout": [{"label":"Num Lock", "x":0, "y":0}, {"label":"/", "x":1, "y":0}, {"label":"*", "x":2, "y":0}, {"label":"-", "x":3, "y":0}, {"label":"7", "x":0, "y":1}, {"label":"8", "x":1, "y":1}, {"label":"9", "x":2, "y":1}, {"label":"+", "x":3, "y":1, "h":2}, {"label":"4", "x":0, "y":2}, {"label":"5", "x":1, "y":2}, {"label":"6", "x":2, "y":2}, {"label":"1", "x":0, "y":3}, {"label":"2", "x":1, "y":3}, {"label":"3", "x":2, "y":3}, {"label":"Enter", "x":3, "y":3, "h":2}, {"label":"0", "x":0, "y":4, "w":2}, {"label":".", "x":2, "y":4}]
        }
    }
}

[tzarc]

Redeployed, seems to be working.