Enable @total-typescript/ts-reset (#1761)

## Description:

Enable `@total-typescript/ts-reset`

Fixes #1760

## 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
- [ ] I have read and accepted the CLA agreement (only required once).

src/core/game/UnitGrid.ts

@@ -144,7 +144,12 @@ export class UnitGrid {
       searchRange,
     );
     const rangeSquared = searchRange * searchRange;
-    const typeSet = Array.isArray(types) ? new Set(types) : new Set([types]);
+    const typeSet = new Set(
+      // Using typeof check instead of Array.isArray due to a typescript
+      // narrowing limitation. For more information, see the full issue
+      // discussion at https://github.com/mattpocock/ts-reset/issues/48
+      typeof types === "object" ? types : [types],
+    );
     for (let cy = startGridY; cy <= endGridY; cy++) {
       for (let cx = startGridX; cx <= endGridX; cx++) {
         for (const type of typeSet) {