Repair new junction logic for crossing wires.

Fixes https://gitlab.com/kicad/code/kicad/issues/9484

eeschema/sch_screen.cpp

@@ -445,6 +445,9 @@ bool SCH_SCREEN::IsJunctionNeeded( const wxPoint& aPosition, bool aNew ) const
             }
             else if( line->HitTest( aPosition, -1 ) )
             {
+                if( aNew )
+                    breakLines[ layer ] = true;
+
                 // Defer any line midpoints until we know whether or not we're breaking them
                 midPointLines[ layer ].push_back( line );
             }

eeschema/tools/sch_drawing_tools.cpp

@@ -725,7 +725,7 @@ int SCH_DRAWING_TOOLS::SingleClickPlace( const TOOL_EVENT& aEvent )
             {
                 if( type == SCH_JUNCTION_T )
                 {
-                    if( !m_frame->GetScreen()->IsJunctionNeeded( cursorPos ) )
+                    if( !m_frame->GetScreen()->IsJunctionNeeded( cursorPos, true ) )
                     {
                         m_frame->ShowInfoBarError( _( "Junction location contains no joinable "
                                                       "wires and/or pins." ) );