recovery_ui: Respect margin_height while drawing battery capacity status

Some devices can use a custom margin height for recovery. Consider this
to draw battery capacity status correctly.

Change-Id: Ib66e88a61db17d6b4735f7f706e718de26df83d8
diff --git a/recovery_ui/screen_ui.cpp b/recovery_ui/screen_ui.cpp
index 4955d87..1e0b657 100644
--- a/recovery_ui/screen_ui.cpp
+++ b/recovery_ui/screen_ui.cpp
@@ -882,7 +882,7 @@
 // Draws the battery capacity on the screen. Should only be called with updateMutex locked.
 void ScreenRecoveryUI::draw_battery_capacity_locked() {
   int x;
-  int y = gr_get_height(lineage_logo_.get());
+  int y = margin_height_ + gr_get_height(lineage_logo_.get());
   int icon_x, icon_y, icon_h, icon_w;
 
   // Battery status