fix: [ui::Text] Overflow::SHRINK does not restore the original font size when text is shortened

[tkzcfc]

fix: #2830

[aismann]

@tkzcfc
Is this not better: replace < with !=?
getRenderingFontSize() != _originalFontSize)

[tkzcfc]

I referenced the existing code logic from our codebase (line 2111 in Label.cpp), which specifically checks for the shrink overflow scenario when the current rendering font size is smaller than the original.

The condition this->getRenderingFontSize() < _originalFontSize is intentional because:

• If the rendering size is already equal to the original size, no rescaling is needed

• If the rendering size is larger than the original, we also don't want to trigger rescaling in this shrink overflow scenario

• We only want to rescale when the current size has become smaller than the original