[rfc][icedtea-web] do not align buttons (in dialogs which do) to minimal size

[Jiri Vanek]

hi!

Some dialogs are trying to have buttons of same width. I'm not sure it is necessary, but undoubtedly 
it cause https://bugzilla.redhat.com/show_bug.cgi?id=1231441

This patch is fixing it.

Without debugging main methods and one null check, I would like to push this also to 1.6 and 1.5


J.
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