Fix wrong case for Dpn\DpnGlossary\Domain\Repository\TermRepository.

The class TermRepository is refereed to with the first letter in lower-case while the definition user an upper-case first letter. This fixes an error with latest TYPO-6.1:

`Could not analyse class:Dpn\DpnGlossary\Domain\Repository\termRepository maybe not loaded or no autoloader`