Fix: only 1 message in 1 toml file

rules/deep_blue_cli/powershell/powershell4103.toml

@@ -1,6 +1,4 @@
 [rule]
 severity = "high"
 name = "4103"
-messages = [
-    ["4103", { ja = "パイプライン実行をしています", en = "Execute Pipeline" }]
-]
+message = "Execute Pipeline"

rules/deep_blue_cli/powershell/powershell4104.toml

@@ -1,6 +1,4 @@
 [rule]
 severity = "high"
 name = "4104"
-messages = [
-    ["4104", { ja = "リモートコマンドを実行します", en = "Excute Remote Command" }]
-]
+message = "Excute Remote Command"

src/models/rule.rs

@@ -5,7 +5,7 @@ use serde::Deserialize;
 pub struct Rule {
     pub severity: Option<String>,
     pub name: Option<String>,
-    pub messages: Option<Vec<(String, String)>>,
+    pub message: Option<String>,
 }
 
 #[derive(Debug, Deserialize)]