minuitwrp: Respect TARGET_RECOVERY_PIXEL_FORMAT config.

Respect TARGET_RECOVERY_PIXEL_FORMAT config in screenshot, graphics.
This fixes other wrong theme color in minuitwrp on Xiaomi MIX 2S.

Change-Id: Ieb8480c411e2f0c72cc50ffca66943ab025e2b7e
diff --git a/minuitwrp/graphics.cpp b/minuitwrp/graphics.cpp
index 81e77a6..d914eef 100644
--- a/minuitwrp/graphics.cpp
+++ b/minuitwrp/graphics.cpp
@@ -157,7 +157,11 @@
     surface->height = diameter;
     surface->stride = diameter;
     surface->data = (GGLubyte*)data;
+#if defined(RECOVERY_BGRA)
+    surface->format = GGL_PIXEL_FORMAT_BGRA_8888;
+#else
     surface->format = GGL_PIXEL_FORMAT_RGBA_8888;
+#endif
 
     for(ry = -radius; ry <= radius; ++ry)
         for(rx = -radius; rx <= radius; ++rx)