Remove source info from log messages

slog.HandlerOptions.AddSource is a cool feature, but since we moved the
logger to a separate package it no longer works. It now always shows
source info for the log package, rather than the code that called it.

This change removes it.

internal/config/config.go

@@ -13,7 +13,6 @@ type AppConfig struct {
 	LogMaxBackups  int    `yaml:"log_max_backups"`
 	LogMaxAgeDays  int    `yaml:"log_max_age_days"`
 	LogCompression bool   `yaml:"log_compression"`
-	LogAddSource   bool   `yaml:"log_add_source"`
 }
 
 var config *AppConfig
@@ -53,5 +52,4 @@ func setDefaults() {
 	viper.SetDefault("LogMaxBackups", 3)
 	viper.SetDefault("LogMaxAgeDays", 365)
 	viper.SetDefault("LogCompression", false)
-	viper.SetDefault("LogAddSource", true)
 }