Revert "JBIDE-17621 - change runtime combo in server editor into disabled text"

This reverts commit 3a1a35a3cfbdac0bf0b9efe7339c7efb503c36cd.
JBIDE-17621 - reversion of previous commit, addition of (No Runtime) element in server editor; small fix to edit server behavior wizard where changes to runtime were executed immediately