GUI: Don't clear ForceIntegerMetrics in font flags
GUI: Don't clear ForceIntegerMetrics in font flags

When setting the font strategy a call to QFont::setStyleHint was unintentionaly
clearning the ForceIntegerMetrics flag. This in turn would reject fonts as
being invalid due to an extra pixel in size.

Pireax/neovim-qt,Pireax/neovim-qt,equalsraf/neovim-qt,equalsraf/neovim-qt,equalsraf/neovim-qt,Pireax/neovim-qt,equalsraf/neovim-qt