Added a loadEnvVars parameter to InitConfig to control whether environment
variables should be loaded via viper.AutomaticEnv(). In tests, environment
variables (like ND_MUSICFOLDER) were overriding values from config test files,
causing tests to fail when these variables were set in the developer's
environment. Now tests can pass loadEnvVars=false to isolate from the
environment while production code continues to use loadEnvVars=true.
Signed-off-by: Deluan <deluan@navidrome.org>
Deluan