Update ScreenRecoveryUI::Draw* function signatures.

Move away from taking int* for the Y-offset. Change it to int and return
the offset instead.

Test: Check the recovery menu and 'Wipe data' menu.
Change-Id: Ib15e070a0d576a0f8f66f35605cb8479e7071f26
diff --git a/vr_ui.h b/vr_ui.h
index da21634..d996c14 100644
--- a/vr_ui.h
+++ b/vr_ui.h
@@ -30,7 +30,7 @@
 
   bool InitTextParams() override;
 
-  void DrawTextLine(int x, int* y, const char* line, bool bold) const override;
+  int DrawTextLine(int x, int y, const char* line, bool bold) const override;
 };
 
 #endif  // RECOVERY_VR_UI_H