Fix extended pickup window

[8street]

Summary

SUMMARY: Bugfixes "Fix extended pickup window"

Purpose of change

When you turn the page in the pickup window, sometimes long names remain as residual text. PR fix this.

Describe the solution

I'd created dynamic length of the clear buffer instead fixed const clear string.

Describe alternatives you've considered

for( int cur_row = 1; cur_row < pickupH; cur_row++ ) {
   for( int cur_column = 0; cur_column < pickupW; cur_column++ ) {
      mvwprintw( w_pickup, point( cur_column, cur_row ), " " );
   }
}

Very slow.

wclear( w_pickup );
wclear() remove weight at the top of the window.

Testing

Before

After