[PATCH] KConfig: Rewrite globals only if modified

[Chusslove Illich]

>> [: Chusslove Illich :]
>> + void KConfigTest::testConservativeWrites()
>
> [: Oswald Buddenhagen :]
> next will be fundamentalist writes? :-D

Failing to come up with a witty retort solution, I changed it to
testWriteOnSync(), and committed everything.

-- 
Chusslove Illich (Часлав Илић)
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