Revert "Manager: add source location when logging in debug/trace mode"

This reverts commit eb65ac9085ca0e86e6dd8a436fb06e766af04d60. It caused
too much logging noise.

cmd/flamenco-manager/main.go

@@ -54,7 +54,6 @@ import (
 )
 
 var cliArgs struct {
-	debug           bool
 	version         bool
 	writeConfig     bool
 	delayResponses  bool
@@ -298,12 +297,8 @@ func buildWebService(
 	// limitations in Go that get in our way here.
 
 	// Hook Zerolog onto Echo:
-	lechoSetters := []lecho.Setter{}
-	if cliArgs.debug {
-		lechoSetters = append(lechoSetters, lecho.WithCaller())
-	}
 	e.Use(lecho.Middleware(lecho.Config{
-		Logger: lecho.From(log.Logger, lechoSetters...),
+		Logger: lecho.From(log.Logger),
 	}))
 
 	// Ensure panics when serving a web request won't bring down the server.
@@ -517,8 +512,6 @@ func parseCliArgs() {
 
 	flag.Parse()
 
-	cliArgs.debug = debug || trace
-
 	var logLevel zerolog.Level
 	switch {
 	case trace: