Userland: Make use of container version of any_of

Problem:
- New `any_of` implementation takes the entire container so the user
  does not need to pass explicit begin/end iterators. This is unused
  except is in tests.

Solution:
- Make use of the new and more user-friendly version where possible.

Userland/Libraries/LibVT/Line.h

@@ -46,7 +46,7 @@ public:
 
     bool is_empty() const
     {
-        return !any_of(m_cells.begin(), m_cells.end(), [](auto& cell) { return cell != Cell(); });
+        return !any_of(m_cells, [](auto& cell) { return cell != Cell(); });
     }
 
     size_t length() const