recovery: compute displayable item count while drawing

Change-Id: Iece9359a5d7fd768748716bc9281578650fcc2d0
diff --git a/recovery_ui/wear_ui.cpp b/recovery_ui/wear_ui.cpp
index 7aaf59b..ecedc1c 100644
--- a/recovery_ui/wear_ui.cpp
+++ b/recovery_ui/wear_ui.cpp
@@ -99,9 +99,8 @@
                                                  const std::vector<std::string>& text_items,
                                                  size_t initial_selection) const {
   if (text_rows_ > 0 && text_cols_ > 0) {
-    return std::make_unique<TextMenu>(false, text_rows_ - menu_unusable_rows_ - 1,
-                                      text_cols_ - 1, text_headers, text_items, initial_selection,
-                                      char_height_, *this);
+    return std::make_unique<TextMenu>(false, text_cols_ - 1, text_headers, text_items,
+                                      initial_selection, char_height_, *this);
   }
 
   return nullptr;