Reset scaled and length after toggling upscaled in QRGdImage

[GaiusCoffey]

After subclassing to overlay a logo, I encountered massive images when using options->drawCircularModules This was caused by scaling in underlying QrGdImage that doesn't reset underlying values.

Proposed changes

Add in an a call to setMatrixDimensions() immediately after toggling upscaled back to false. This should be a low cost way to reset the length and scale values to allow subclasses to use the output of dump()

Types of changes

What types of changes does your code introduce?

• [x] Bugfix (non-breaking change which fixes an issue)

Checklist:

• [x] I have checked to ensure there aren't other open Issues or Pull Requests for the same update/change

[codemasher]

Hey that's a reasonable change! I haven't considered this possibility yet. Thanks for your contribution!