Do not repeat code whenever possible

Signed-off-by: Shin'ya Minazuki <shinyoukai@laidback.moe>

cmd/mikuru-post/main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"log"
-	"os"
 
 	"git.laidback.moe/shinyoukai/mikuru"
 	"go.yarn.social/client"
@@ -10,13 +9,7 @@ import (
 )
 
 func init() {
-	config, err := os.UserConfigDir()
-	if err != nil {
-		log.Fatalf("%s\n")
-	}
-
-	configPath := config + "/mikuru.ini"
-	mikuru.Parse(configPath)
+	mikuru.ConfInit()
 }
 
 func main() {