[TESTS] increase test-sqlite log level to Trace

It does not pollute the output because they go to sqlite-log/gitea.log
and it may provide clues for debugging. When trying to figure out a
problem in production, Debug is likely to be used but in a development
environment a very fine grain log is the most useful. If that's really
too much noise, the lines can be trimmed by removing all those with [T].

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tests/sqlite.ini.tmpl

@@ -90,7 +90,7 @@ LEVEL                = Info
 COLORIZE             = true
 
 [log.file]
-LEVEL                = Debug
+LEVEL                = Trace
 
 [security]
 PASSWORD_HASH_ALGO = argon2