Use function expression name if it has one

[andrewiggins]

Component's like

var render = function App() { ... }

will now by transformed by the babel plugin since the function expression has a valid Component name.

Before it would not be transformed because the variable name was not valid because the variable name begins with a lowercase letter.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: ca716b35bfab1981e6d41033c5b19309d8164524

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------------------- | ----- | | @preact/signals-react-transform | Minor |

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Click here if you're a maintainer who wants to add another changeset to this PR

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[github-actions[bot]]

Size Change: +12 B (0%)

Total Size: 83.9 kB

Filename	Size	Change
packages/react-transform/dist/signals-*********.js	4.77 kB	+4 B (0%)
packages/react-transform/dist/signals-transform.mjs	4.02 kB	+4 B (0%)
packages/react-transform/dist/signals-transform.umd.js	4.88 kB	+4 B (0%)

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `docs/dist/assets/client.********.js` | 46.8 kB | | `docs/dist/assets/index.********.js` | 1.07 kB | | `docs/dist/assets/jsxRuntime.module.********.js` | 281 B | | `docs/dist/assets/preact.module.********.js` | 4.02 kB | | `docs/dist/assets/signals-core.module.********.js` | 1.46 kB | | `docs/dist/assets/signals.module.********.js` | 2.02 kB | | `docs/dist/assets/style.********.js` | 21 B | | `docs/dist/assets/style.********.css` | 1.21 kB | | `docs/dist/basic-********.js` | 244 B | | `docs/dist/demos-********.js` | 3.41 kB | | `docs/dist/nesting-********.js` | 1.13 kB | | `docs/dist/react-********.js` | 239 B | | `packages/core/dist/signals-core.js` | 1.54 kB | | `packages/core/dist/signals-core.mjs` | 1.56 kB | | `packages/preact/dist/signals.js` | 1.27 kB | | `packages/preact/dist/signals.mjs` | 1.22 kB | | `packages/react/dist/signals.js` | 1.43 kB | | `packages/react/dist/signals.mjs` | 1.34 kB |

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