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acme: fix off by one in colclose(), make dellist() code consistent

--- a/sys/src/cmd/acme/cols.c

+++ b/sys/src/cmd/acme/cols.c

@@ -131,8 +131,8 @@

 		windelete(w);

 		winclose(w);

 	}

-	memmove(c->w+i, c->w+i+1, (c->nw-i)*sizeof(Window*));

 	c->nw--;

+	memmove(c->w+i, c->w+i+1, (c->nw-i)*sizeof(Window*));

 	c->w = realloc(c->w, c->nw*sizeof(Window*));

 	if(c->nw == 0){

 		draw(screen, r, display->white, nil, ZP);

--- a/sys/src/cmd/acme/edit.c

+++ b/sys/src/cmd/acme/edit.c

@@ -267,8 +267,8 @@

 void

 dellist(List *l, int i)

 {

-	memmove(&l->ptr[i], &l->ptr[i+1], (l->nused-(i+1))*sizeof(void*));

 	l->nused--;

+	memmove(&l->ptr[i], &l->ptr[i+1], (l->nused-i)*sizeof(void*));

 }

 /*