fix segfault in PSD COS parser

Arimilrequested to merge
arimil/krita:master into master

I have an old PSD that was crashing when trying to open it in Krita, it seems that the COS parser reading invalid memory.

/AutoHyphenate true

would try to be parsed, it would match else if (c == 't') but then try to read rue into an uninitialized byte array.

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