rc: config/listremotes include from env vars

Fixes: 
#6540

Discussed:
https://forum.rclone.org/t/environment-variable-config-not-used-for-remote-control/39014

fs/config/rc.go

@@ -59,7 +59,7 @@ func init() {
 	rc.Add(rc.Call{
 		Path:         "config/listremotes",
 		Fn:           rcListRemotes,
-		Title:        "Lists the remotes in the config file.",
+		Title:        "Lists the remotes in the config file and defined in environment variables.",
 		AuthRequired: true,
 		Help: `
 Returns
@@ -71,8 +71,9 @@ See the [listremotes](/commands/rclone_listremotes/) command for more informatio
 }
 
 // Return the a list of remotes in the config file
+// including any defined by environment variables.
 func rcListRemotes(ctx context.Context, in rc.Params) (out rc.Params, err error) {
-	remotes := LoadedData().GetSectionList()
+	remotes := FileSections()
 	out = rc.Params{
 		"remotes": remotes,
 	}

fs/config/rc_test.go

@@ -2,6 +2,7 @@ package config_test
 
 import (
 	"context"
+	"os"
 	"testing"
 
 	_ "github.com/rclone/rclone/backend/local"
@@ -68,6 +69,10 @@ func TestRc(t *testing.T) {
 	})
 
 	t.Run("ListRemotes", func(t *testing.T) {
+		assert.NoError(t, os.Setenv("RCLONE_CONFIG_MY-LOCAL_TYPE", "local"))
+		defer func() {
+			assert.NoError(t, os.Unsetenv("RCLONE_CONFIG_MY-LOCAL_TYPE"))
+		}()
 		call := rc.Calls.Get("config/listremotes")
 		assert.NotNil(t, call)
 		in := rc.Params{}
@@ -80,6 +85,7 @@ func TestRc(t *testing.T) {
 		require.NoError(t, err)
 
 		assert.Contains(t, remotes, testName)
+		assert.Contains(t, remotes, "my-local")
 	})
 
 	t.Run("Update", func(t *testing.T) {