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/operators/delete-globalThis-property-crash.js

@@ -1,10 +1,10 @@
 load("test-common.js");
 
 try {
-    a = 1;
-    assert(delete globalThis.a === true);
-    a = 2;
-    console.log("PASS");
+  a = 1;
+  assert(delete globalThis.a === true);
+  a = 2;
+  console.log("PASS");
 } catch (e) {
-    console.log("FAIL: " + e);
+  console.log("FAIL: " + e);
 }