[jnc_ct] adjust sync-set for statements
[jnc_ct] adjust sync-set for statements

re-synchining on '}' is just bad -- it prematurely closes the error-containing scope;
at the same time, adding '{' to the sync-set is actually a good idea -- it might lead to unbalanced scopes, but it should be OK for code-assist (if we have more and deeper scopes than we should).

vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy