Remove backend config mapping for logUserTZ

Since logUserTZ conversion will happen on the frontend, we no longer
need to store this configuration in the Nebula agent config.

nebula/config.go

@@ -154,7 +154,6 @@ type configLogging struct {
 	Level           string `yaml:"level"`
 	Format          string `yaml:"format"`
 	TimestampFormat string `yaml:"timestamp_format,omitempty"`
-	UserTimeZone    bool   `yaml:"logLocalTZ"`
 }
 
 type configStats struct {

nebula/mobileNebula.go

@@ -65,9 +65,6 @@ func RenderConfig(configData string, key string) (string, error) {
 		config.Logging.Level = val
 	}
 
-	b, _ := d["logLocalTZ"].(bool)
-	config.Logging.UserTimeZone = bool(b)
-
 	i, _ = d["lhDuration"].(float64)
 	config.Lighthouse.Interval = int(i)