changes osx fallback symbol font style
changes osx fallback symbol font style

Previously, the fallback symbol font copied the style of the font from
the config. However, the only available style for the fallback symbol
font is Normal slant, Normal weight.

jwilm/alacritty,jwilm/alacritty,alacritty/alacritty,jwilm/alacritty,jwilm/alacritty,alacritty/alacritty