fix: remove space in zig object notation hl group (#397)

Author: zyriab

lua/nvim-web-devicons/icons-default.lua

@@ -393,7 +393,7 @@ local icons_by_filename = {
     icon = "",
     color = "#f69a1b",
     cterm_color = "172",
-    name = "Zig Object Notation",
+    name = "ZigObjectNotation",
   },
 }
 

lua/nvim-web-devicons/icons-light.lua

@@ -393,7 +393,7 @@ local icons_by_filename = {
     icon = "",
     color = "#7b4d0e",
     cterm_color = "94",
-    name = "Zig Object Notation",
+    name = "ZigObjectNotation",
   },
 }