tetris: lower the next-piece preview a few more pixels within its frame

src/games/tetris.cpp

@@ -289,7 +289,7 @@ static void render() {
   draw_text(sx, py0, 1, C_DIM, "NEXT");
   // framed preview box for the next piece
   int boxY = py0 + 10;
-  int boxH = 48;
+  int boxH = 52;
   XSetForeground(dpy, gc, C_DIM);
   XDrawRectangle(dpy, back, gc, sx, boxY, winW - sx - 4, boxH);
   int nc[4][2];
@@ -305,7 +305,7 @@ static void render() {
   int pcols = maxx - minx + 1;
   int prows = maxy - miny + 1;
   int nx0 = sx + ((winW - sx - 4) - pcols * pcell) / 2;
-  int ny0 = boxY + (boxH - prows * pcell) / 2;
+  int ny0 = boxY + (boxH - prows * pcell) / 2 + 8;  // sit lower in the frame
   XSetForeground(dpy, gc, C_HEAD);
   for (int i = 0; i < 4; i++) {
     int cx = nx0 + (nc[i][0] - minx) * pcell;