test-js: Use prettier and format all files

Author: https://github.com/mattco98
Commit: 6d58c48c2f
Pull-request: https://github.com/SerenityOS/serenity/pull/2689
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/builtins/Math/Math.abs.js

@@ -1,14 +1,14 @@
 test("basic functionality", () => {
-    expect(Math.abs).toHaveLength(1);
+  expect(Math.abs).toHaveLength(1);
 
-    expect(Math.abs('-1')).toBe(1);
-    expect(Math.abs(-2)).toBe(2);
-    expect(Math.abs(null)).toBe(0);
-    expect(Math.abs('')).toBe(0);
-    expect(Math.abs([])).toBe(0);
-    expect(Math.abs([2])).toBe(2);
-    expect(Math.abs([1, 2])).toBeNaN();
-    expect(Math.abs({})).toBeNaN();
-    expect(Math.abs('string')).toBeNaN();
-    expect(Math.abs()).toBeNaN();
+  expect(Math.abs("-1")).toBe(1);
+  expect(Math.abs(-2)).toBe(2);
+  expect(Math.abs(null)).toBe(0);
+  expect(Math.abs("")).toBe(0);
+  expect(Math.abs([])).toBe(0);
+  expect(Math.abs([2])).toBe(2);
+  expect(Math.abs([1, 2])).toBeNaN();
+  expect(Math.abs({})).toBeNaN();
+  expect(Math.abs("string")).toBeNaN();
+  expect(Math.abs()).toBeNaN();
 });