chore: Resolve unused variable warning

Author: ByteAurora

src/main/kotlin/com/github/ilovegamecoding/intellijcodexp/activities/CodeXPStartupActivity.kt

@@ -7,6 +7,6 @@ import com.intellij.openapi.startup.StartupActivity
 
 class CodeXPStartupActivity : StartupActivity {
     override fun runActivity(project: Project) {
-        val codeXPService = ApplicationManager.getApplication().getService(CodeXPService::class.java)
+        ApplicationManager.getApplication().getService(CodeXPService::class.java)
     }
 }