Fix admin settings initialization (#31)

internal/models/db.go

@@ -27,8 +27,9 @@ func Setup(dbpath string) error {
 
 	// Default admin setting values
 	return initAdminSettings(map[string]string{
-		SettingDisableSignup: "0",
-		SettingRequireLogin:  "0",
+		SettingDisableSignup:    "0",
+		SettingRequireLogin:     "0",
+		SettingDisableLoginForm: "0",
 	})
 }