Patterned territory (#786)

## Description:
This is meant to give players more customization options.
Permission handling hasn’t really been implemented yet.
## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

aotumuri

src/client/SinglePlayerModal.ts

@@ -11,6 +11,7 @@ import {
   UnitType,
   mapCategories,
 } from "../core/game/Game";
+import { UserSettings } from "../core/game/UserSettings";
 import { generateID } from "../core/Util";
 import "./components/baseComponents/Button";
 import "./components/baseComponents/Modal";
@@ -41,6 +42,8 @@ export class SinglePlayerModal extends LitElement {
 
   @state() private disabledUnits: UnitType[] = [];
 
+  private userSettings: UserSettings = new UserSettings();
+
   render() {
     return html`
       <o-modal title=${translateText("single_modal.title")}>
@@ -410,6 +413,7 @@ export class SinglePlayerModal extends LitElement {
                   flagInput.getCurrentFlag() === "xx"
                     ? ""
                     : flagInput.getCurrentFlag(),
+                pattern: this.userSettings.getSelectedPattern(),
               },
             ],
             config: {