Meta: Remove a couple of files from .prettierignore

These are now formatted just fine and no longer cause errors or
unintended formatting changes.

.prettierignore

@@ -1,8 +1,3 @@
 Base/home/anon/Source/js
-Userland/Libraries/LibJS/Tests/builtins/Object/Object.prototype.toString.js
-Userland/Libraries/LibJS/Tests/eval-aliasing.js
-Userland/Libraries/LibJS/Tests/if-statement-function-declaration.js
 Userland/Libraries/LibJS/Tests/invalid-lhs-in-assignment.js
-Userland/Libraries/LibJS/Tests/operators/delete-global-variable.js
-Userland/Libraries/LibJS/Tests/operators/delete-local-variable.js
 Userland/Libraries/LibJS/Tests/unicode-identifier-escape.js