PNS: Remove items from all layers

subIndices control which layers the items are inserted onto and removed
from.  The iterator to remove items needs to be inclusive of the
first/last layers

Fixes https://gitlab.com/kicad/code/kicad/issues/5090

Fixes https://gitlab.com/kicad/code/kicad/issues/5075

Fixes https://gitlab.com/kicad/code/kicad/issues/5034

pcbnew/router/pns_index.cpp

@@ -49,7 +49,7 @@ void INDEX::Remove( ITEM* aItem )
     if( m_subIndices.size() <= static_cast<size_t>( range.End() ) )
         return;
 
-    for( int i = range.Start(); i < range.End(); ++i )
+    for( int i = range.Start(); i <= range.End(); ++i )
         m_subIndices[i].Remove( aItem );
 
     m_allItems.erase( aItem );