Cannot filter symbols with "^=" in the minibuffer (vertico module)

### What did you expect to happen?

Find Elisp symbols that begin with "=".

### What actually happened?

The minibuffer's returned results are empty.

### Describe your attempts to resolve the issue

Remove `+vertico-orderless-dispatch` from `orderless-style-dispatchers`.

Because those
```lisp
;; Literal matching
((string-prefix-p "=" pattern) `(orderless-literal . ,(substring pattern 1)))
((string-suffix-p "=" pattern) `(orderless-literal . ,(substring pattern 0 -1)))
```
Doesn't check if pattern is a non-literal regular expression.

### Steps to reproduce

1. Enable `:completion vertico`
2. `M-x helpful-symbol`
3. Type "^="

### System Information

https://pastebin.com/1AA9qwgG