fix: ignore modifiers on all modifier keys

This allows combining of modifier key event keybindings without having
to bind all modifier combinations. ie. with this we can use fast_scroll
and jump_mode at the same time by holding both modifiers down.

src/keybind/keybind.zig

@@ -717,6 +717,9 @@ const BindingSet = struct {
         const mods = switch (key_event.key) {
             input.key.left_control, input.key.right_control => 0,
             input.key.left_alt, input.key.right_alt => 0,
+            input.key.left_shift, input.key.right_shift => 0,
+            input.key.left_super, input.key.right_super => 0,
+            input.key.iso_level_3_shift, input.key.iso_level_5_shift => 0,
             else => switch (mode_flag) {
                 .ignore_alt_text_modifiers => if (std.mem.eql(u8, text, codepoint)) key_event.modifiers else 0,
                 .normal => key_event.modifiers,