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/functions/function-missing-arg.js

@@ -1,13 +1,15 @@
 load("test-common.js");
 
-function foo(a, b) { return a + b; }
+function foo(a, b) {
+  return a + b;
+}
 
 try {
-    assert(isNaN(foo()) === true);
-    assert(isNaN(foo(1)) === true);
-    assert(foo(2, 3) === 5);
-    assert(foo(2, 3, 4) === 5);
-    console.log("PASS");
+  assert(isNaN(foo()) === true);
+  assert(isNaN(foo(1)) === true);
+  assert(foo(2, 3) === 5);
+  assert(foo(2, 3, 4) === 5);
+  console.log("PASS");
 } catch (e) {
-    console.log("FAIL: " + e);
+  console.log("FAIL: " + e);
 }