Kernel: Don't clear VirtualConsoles when initializing

Instead of calling clear() for each virtual console we initialize, we
only call clear() when activating it from ConsoleManagement.

Kernel/TTY/VirtualConsole.cpp

@@ -126,7 +126,6 @@ UNMAP_AFTER_INIT void VirtualConsole::initialize()
     for (size_t row = 0; row < rows(); row++) {
         m_lines.append({ true, 0 });
     }
-    clear();
     VERIFY(m_cells);
 }