Fix custom colorscheme not loading (Close #93)

colorschemes/default.json

@@ -1,5 +1,5 @@
 // Example json file to put in `~/.config/gotop/{name}.json` and load with
-// `gotop -c {name}`. MUST DELETE THESE COMMENTS in order to load.
+// `gotop -c {name}`. MUST DELETE THESE COMMENTS AND RENAME FILE in order to load.
 {
 	"Fg": 7,
 	"Bg": -1,

main.go

@@ -125,10 +125,11 @@ func handleColorscheme(cs string) error {
 	case "default-dark":
 		colorscheme = colorschemes.DefaultDark
 	default:
-		if colorscheme, err := getCustomColorscheme(cs); err != nil {
-			colorscheme = colorscheme
+		custom, err := getCustomColorscheme(cs)
+		if err != nil {
 			return err
 		}
+		colorscheme = custom
 	}
 	return nil
 }