minui: Fix a wrong arg in calling GRSurface::Create().

This is a bug introduced while refactoring init_display_surface(), in
[1]. As a result, user of res_create_multi_display_surface(), which is
effectively `charger` right now, crashes due to buffer overrun.

This CL fixes the wrong arg and adds a sanity test for
res_create_multi_display_surface(). The testdata (battery_scale.png) is
copied from system/core/healthd/images/battery_scale.png.

[1] commit 44820ac1.

Bug: 119122296
Test: Run recovery_unit_test on marlin.
Test: Build and boot into charger mode on blueline. Verify that
      `charger` no longer crashes.
Change-Id: Ib6d083e1512a9c3c6eb63874d26d22658921d693