[5.3] Spelling Update TemplateModel.php

[brianteeman]

Fixes spelling mistake introduced with [5.3] PHPStan: Fixing return statements and types (#44030)

code review

[richard67]

I have tested this item ✅ successfully on 6970e79

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[fgsw]

I have tested this item ✅ successfully on 6970e79

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44268.}

[richard67]

RTC

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[brianteeman]

thanks