Ignore IllegalStateException from Runtime#removeShutdownHook

Author: freya022

src/main/kotlin/io/github/freya022/botcommands/internal/core/service/BCShutdownHook.kt

@@ -31,7 +31,11 @@ internal class BCShutdownHook internal constructor(
     @BEventListener
     internal fun onShuttingDown(event: BStatusChangeEvent) {
         if (event.newStatus == BContext.Status.SHUTTING_DOWN) {
-            Runtime.getRuntime().removeShutdownHook(hook)
+            try {
+                Runtime.getRuntime().removeShutdownHook(hook)
+            } catch (_: IllegalStateException) {
+                //
+            }
         }
     }