qconfig initial slider sizes fix.

On first `make xconfig`, suboption and help panels were hidden.
Now we properly detect the first run, and show those panels.
Reported-by: NJason Vas Dias <jason.vas.dias@gmail.com>
Signed-off-by: NBoris Barbulovski <bbarbulovski@gmail.com>
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Tested-by: NRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: NMichal Marek <mmarek@suse.com>