container: remove global msg

This frees all container instances of side effects.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/app/state/multi_test.go

@@ -1,9 +1,13 @@
 package state_test
 
 import (
+	"log"
 	"testing"
 
+	"hakurei.app/container"
 	"hakurei.app/internal/app/state"
 )
 
-func TestMulti(t *testing.T) { testStore(t, state.NewMulti(t.TempDir())) }
+func TestMulti(t *testing.T) {
+	testStore(t, state.NewMulti(container.NewMsg(log.New(log.Writer(), "multi: ", 0)), t.TempDir()))
+}