Make a choice of the encoder in the form

Made a choice of the encoder by categories: video, audio and photo.

internal/controller/convertor.go

@@ -7,11 +7,18 @@ import (
 )
 
 func (c *controller) convertor() {
+	formats, err := c.app.GetConvertorService().GetSupportFormats()
+	if err != nil {
+		c.startWithError(err)
+		return
+	}
+
 	content := view.Convertor(
 		c.window,
 		c.addFileForConversion,
 		c.app.GetSetting().GetDirectoryForSaving(),
 		c.setDirectoryForSaving,
+		formats,
 	)
 	c.window.SetContent(content)
 }