not PR #1102 - map refresh during #terrain

This fixes the part of pull request #1102 by entrez dealing with the
map refresh side of things.  It was pulled out of a much larger patch
that also deals with terminal window resize for tty.

Using ^R when getpos() is in operation, whether actually picking a
position for something or browsing the map during #terrain or post
detection magic, it was reconstructing the known map and positioning
the cursor on the hero instead redrawing the selected terrain subset
or detected objects/monsters/whatever.  There's already a routine to
redraw the current view of the map without recalculating it, but it
wasn't being used for ^R during getpos operation.

win/tty/wintty.c

@@ -3438,7 +3438,7 @@ tty_cliparound(int x, int y)
         clipy = clipymax - (LI - 1 - iflags.wc2_statuslines);
     }
     if (clipx != oldx || clipy != oldy) {
-        redraw_map(); /* ask the core to resend the map window's data */
+        redraw_map(TRUE); /* ask the core to resend the map window's data */
     }
 }
 #endif /* CLIPPING */