Simulate helix line wrapping (#32763)

In helix the `f`, `F`, `t`, `T`, left and right motions wrap lines. I
added that by default.

Release Notes:

- vim: The `use_multiline_find` setting is replaced by binding to the
correct action in the keymap:
    ```
"f": ["vim::PushFindForward", { "before": false, "multiline": true }],
"t": ["vim::PushFindForward", { "before": true, "multiline": true }],
"shift-f": ["vim::PushFindBackward", { "after": false, "multiline": true
}],
"shift-t": ["vim::PushFindBackward", { "after": true, "multiline": true
}],
    ```
- helix: `f`/`t`/`shift-f`/`shift-t`/`h`/`l`/`left`/`right` are now
multiline by default (like helix)

assets/settings/default.json

@@ -1734,7 +1734,6 @@
     "default_mode": "normal",
     "toggle_relative_line_numbers": false,
     "use_system_clipboard": "always",
-    "use_multiline_find": false,
     "use_smartcase_find": false,
     "highlight_on_yank_duration": 200,
     "custom_digraphs": {},