fix: use get_dbversions instead of db_versions

[motorina0]

The use of click in the app itself is an issue. The click.echo() method tries to consume the command line arguments.
In this example port:

poetry run lnbits --port 5555

The error was:

click.exceptions.NoSuchOption: No such option: --port

This issue was reported for a docker run.

Steps:

• remove the files of an extension
• start server with this command poetry run lnbits --port 5555

Actual Result:
An exception is thrown:

Error: No such option: --port
2024-02-09 12:29:34.32 | ERROR | Traceback (most recent call last):
  File "/Users/moto/Library/Caches/pypoetry/virtualenvs/lnbits-_FscvqzI-py3.9/lib/python3.9/site-packages/click/core.py", line 1077, in main
    with self.make_context(prog_name, args, **extra) as ctx:
  File "/Users/moto/Library/Caches/pypoetry/virtualenvs/lnbits-_FscvqzI-py3.9/lib/python3.9/site-packages/click/core.py", line 943, in make_context
    self.parse_args(ctx, args)
  File "/Users/moto/Library/Caches/pypoetry/virtualenvs/lnbits-_FscvqzI-py3.9/lib/python3.9/site-packages/click/core.py", line 1405, in parse_args
    opts, args, param_order = parser.parse_args(args=args)
  File "/Users/moto/Library/Caches/pypoetry/virtualenvs/lnbits-_FscvqzI-py3.9/lib/python3.9/site-packages/click/parser.py", line 337, in parse_args
    self._process_args_for_options(state)
  File "/Users/moto/Library/Caches/pypoetry/virtualenvs/lnbits-_FscvqzI-py3.9/lib/python3.9/site-packages/click/parser.py", line 364, in _process_args_for_options
    self._process_opts(arg, state)
  File "/Users/moto/Library/Caches/pypoetry/virtualenvs/lnbits-_FscvqzI-py3.9/lib/python3.9/site-packages/click/parser.py", line 514, in _process_opts
    self._match_long_opt(norm_long_opt, explicit_value, state)
  File "/Users/moto/Library/Caches/pypoetry/virtualenvs/lnbits-_FscvqzI-py3.9/lib/python3.9/site-packages/click/parser.py", line 398, in _match_long_opt
    raise NoSuchOption(opt, possibilities=possibilities, ctx=self.ctx)
click.exceptions.NoSuchOption: No such option: --port

Expected Result:

• server starts normally (with the fix in this PR)

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (194a527) 59.26% compared to head (9628b9a) 59.26%.

Files	Patch %	Lines
lnbits/app.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #2255   +/-   ##
=======================================
  Coverage   59.26%   59.26%           
=======================================
  Files          60       60           
  Lines        8992     8992           
=======================================
  Hits         5329     5329           
  Misses       3663     3663           

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