Settings: revert to our old default size (2/2)

played so much with the stock dpi values to optimize that
I set the default value for our slim dpi a bit to low :p

Roms which use stock phon dpi can leaver it like it is

But should kang the correspondent frameworks patch which
allows more flexible size changes

cheers

Change-Id: Id251862be544e2408d8059037708ee84868f6b87