fixed issue with jpeg images showing in revert color

[spirosbond]

When I use Black&White mode (1-Bit), the images are being drawn with reverse "colors"

Code I am using to initialize the display:

#if GRAYSCALE == 1
Inkplate display(INKPLATE_3BIT);
#else
Inkplate display(INKPLATE_1BIT);
#endif

Code I am using to draw image:

display->drawImage(imgPath.c_str(), x, y, 1, 0);

Input Image:

Rendered image:

If I set the "invert" option to 1 and still use 1-BitMode, I get a full black image:
display->drawImage(imgPath.c_str(), x, y, 1, 1);

If I use Grayscale (3-Bit) and use this line of code, the image shows up correctly:

display->drawImage(imgPath.c_str(), x, y, 1, 0);

This commit is fixing the issue and prints the images correctly.