[NTOS:INBV] Fix screen flash and more (#2821)

- Fix screen flash (CORE-16786);
- Don't process rotating bar if not used.

ntoskrnl/inbv/inbv.c

@@ -1279,12 +1279,12 @@ DisplayBootBitmap(IN BOOLEAN TextMode)
 #endif
 
 #ifdef INBV_ROTBAR_IMPLEMENTED
-        if (Bar)
+        if ((TempRotBarSelection == RB_SQUARE_CELLS) && Bar)
         {
             /* Save previous screen pixels to buffer */
             InbvScreenToBufferBlt(Buffer, 0, 0, 22, 9, 24);
             /* Draw the progress bar bit */
-            InbvBitBlt(Bar, 0, 0);
+            BitBltPalette(Bar, TRUE, 0, 0);
             /* Store it in global buffer */
             InbvScreenToBufferBlt(RotBarBuffer, 0, 0, 22, 9, 24);
             /* Restore screen pixels */