Remove unused mock

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

__mocks__/FontManager.js

@@ -1,6 +0,0 @@
-// Stub out FontManager for tests as it doesn't validate anything we don't already know given
-// our fixed test environment and it requires the installation of node-canvas.
-
-module.exports = {
-    fixupColorFonts: () => Promise.resolve(),
-};

jest.config.ts

@@ -32,7 +32,6 @@ const config: Config = {
         "decoderWorker\\.min\\.wasm": "<rootDir>/__mocks__/empty.js",
         "waveWorker\\.min\\.js": "<rootDir>/__mocks__/empty.js",
         "context-filter-polyfill": "<rootDir>/__mocks__/empty.js",
-        "FontManager.ts": "<rootDir>/__mocks__/FontManager.js",
         "workers/(.+)Factory": "<rootDir>/__mocks__/workerFactoryMock.js",
         "^!!raw-loader!.*": "jest-raw-loader",
         "recorderWorkletFactory": "<rootDir>/__mocks__/empty.js",