OLEDrgb_DrawRectangle colors off by 1

[d-burnett]

Per the "Drawing Rectangle" section of page 32 of the SSD1331 datasheet, bits corresponding to color A and color C include 1 bit of padding. This means fillColor should be padded in four places inside the OLEDrgb_DrawRectangle function as written below. I have tested and verified these revisions.

   cmds[7] = OLEDrgb_ExtractRFromRGB(lineColor) << 1;   // R
   cmds[8] = OLEDrgb_ExtractGFromRGB(lineColor);   // G
   cmds[9] = OLEDrgb_ExtractBFromRGB(lineColor) << 1;   // B

   cmds[10] = OLEDrgb_ExtractRFromRGB(fillColor) << 1;  // R
   cmds[11] = OLEDrgb_ExtractGFromRGB(fillColor);  // G
   cmds[12] = OLEDrgb_ExtractBFromRGB(fillColor) << 1;  // B