CODETOOLS-7902877: jcstress: Fix C2-only configuration filtering

[shipilev]

CODETOOLS-7902872 rewrote CompileMode code, and introduced a little regression here:
6715852?branch=67158528f9abdf49f9ae23c704c068a76075b4fe&diff=unified#diff-90c43d0da51e119c248c273763e3e5d3b6b14586492fb836c480ecd144af56e5L143-R144

The filter should say "config.onlyIfC2() && !hasC2". The "!" was accidentally dropped.

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Progress

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Issue

• CODETOOLS-7902877: jcstress: Fix C2-only configuration filtering

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