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Appropriately generate MOVE_NO_EFFECT from '\b' in Guess

This is the case that I care about for KaiOS.

--- a/guess.c

+++ b/guess.c

@@ -943,9 +943,12 @@

             ui->peg_cur++;

         ret = MOVE_UI_UPDATE;

     } else if (button == 'D' || button == 'd' || button == '\b') {

-        ui->display_cur = true;

-        set_peg(&from->params, ui, ui->peg_cur, 0);

-        ret = MOVE_UI_UPDATE;

+        if (!ui->display_cur || ui->curr_pegs->pegs[ui->peg_cur] != 0) {

+            ui->display_cur = true;

+            set_peg(&from->params, ui, ui->peg_cur, 0);

+            ret = MOVE_UI_UPDATE;

+        } else

+            ret = MOVE_NO_EFFECT;

     } else if (button == CURSOR_SELECT2) {

         if (ui->peg_cur == from->params.npegs)

             return NULL;