Fix various ESLint violations (#402)

## Description:

Fixes a number of ESLint violations. Although I have tested these
changes through the local dev server, I don't have a high confidence
that the testing is sufficient, as I am new to this codebase. This
change would benefit from heightened scrutiny.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [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:

fake.neo

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/client/graphics/GameRenderer.ts

@@ -40,7 +40,6 @@ export function createRenderer(
   const startingModal = document.querySelector(
     "game-starting-modal",
   ) as GameStartingModal;
-  startingModal instanceof GameStartingModal;
   startingModal.hide();
 
   // TODO maybe append this to dcoument instead of querying for them?

src/client/graphics/layers/StructureLayer.ts

@@ -216,7 +216,7 @@ export class StructureLayer implements Layer {
 
   private handleUnitRendering(unit: UnitView) {
     const unitType = unit.constructionType() ?? unit.type();
-    let iconType = unitType;
+    const iconType = unitType;
     if (!this.isUnitTypeSupported(unitType)) return;
 
     const config = this.unitConfigs[unitType];

src/client/graphics/layers/WinModal.ts

@@ -12,11 +12,12 @@ import { Layer } from "./Layer";
 // Add this at the top of your file
 declare global {
   interface Window {
-    adsbygoogle: any[];
+    adsbygoogle: unknown[];
   }
 }
+
 // Add this at the top of your file
-declare let adsbygoogle: any[];
+declare let adsbygoogle: unknown[];
 
 @customElement("win-modal")
 export class WinModal extends LitElement implements Layer {
@@ -257,7 +258,7 @@ export class WinModal extends LitElement implements Layer {
     });
   }
 
-  renderLayer(context: CanvasRenderingContext2D) {}
+  renderLayer(/* context: CanvasRenderingContext2D */) {}
 
   shouldTransform(): boolean {
     return false;