E fm: Fixed weird icon sizes issue.
E fm: Fixed weird icon sizes issue.

Apparently, when doing min size calculation we take hidden parts into
account, which caused the calculation to be wrong in this case.
Setting the hidden textblock to fixed solved the issue.

SVN revision: 59788

FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,FlorentRevest/Enlightenment,rvandegrift/e,tasn/enlightenment,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,rvandegrift/e,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment