LibGfx+Base: Tweak bitmap fonts to ensure glyph data is 4-byte aligned

When building userland with UBSAN enabled (#7434), we were getting
spammed to death by unaligned access errors.

Fix these by adding 2 bytes of padding to the FontFileHeader struct,
and adjusting all our font files to match the new format. :^)

Userland/Libraries/LibGfx/BitmapFont.cpp

@@ -35,8 +35,11 @@ struct [[gnu::packed]] FontFileHeader {
     u16 weight;
     char name[32];
     char family[32];
+    u16 unused;
 };
 
+static_assert(sizeof(FontFileHeader) == 80);
+
 NonnullRefPtr<Font> BitmapFont::clone() const
 {
     size_t bytes_per_glyph = sizeof(u32) * glyph_height();