[fix] granian: enabling debug on searxng-docker causes server crash (#4985)

When debugging is enabled, the context in which the process is running (uWSGI or
`Flask.run` server) was previously checked [1]. This check has not yet taken the
granian server into account.

----

The check is actually only required for the developer environment (`make run`)
[2] and is intended to prevent double loading of modules when initializing a
Flask server [3].

In the long term, we should find a more robust solution that explicitly enables
the specific features of a development environment via switches. Further
information on this problematic code can be found in [4][5][6].

[1] https://github.com/searxng/searxng/issues/4973#issuecomment-3047890957
[2] https://flask.palletsprojects.com/en/stable/api/#flask.Flask.run
[3] https://github.com/pallets/flask/issues/5307#issuecomment-1774646119
[4] https://github.com/searxng/searxng/pull/1656#issuecomment-1214198941
[5] https://github.com/searxng/searxng/pull/1616#issuecomment-1206137468
[6] https://stackoverflow.com/a/25504196

- closes: https://github.com/searxng/searxng/issues/4973

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

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