fix: remove extra class-props babel plugin

[merrywhether]

Summary

The@babel/plugin-proposal-class-properties no longer needs to be explicitly added, as it is now incorporated into @babel/preset-env. You can see this in a freshly generated RN library by adding debug: true to this default configuration:

% yarn bob build yarn run v1.22.19 $ .../rnlib/node_modules/.bin/bob build ℹ Building target commonjs ℹ Cleaning up previous build at lib/commonjs ℹ Compiling 1 files in src with babel @babel/preset-env: `DEBUG` option Using targets: { "chrome": "108", "edge": "108", "firefox": "108", "ios": "15.6", "node": "16", "safari": "15.6", "samsung": "19" } Using modules transform: commonjs Using plugins: proposal-class-static-block { ios, node < 16.11, safari } proposal-private-property-in-object { node < 16.9 } syntax-class-properties <---- syntax-numeric-separator syntax-nullish-coalescing-operator proposal-optional-chaining { node < 16.9 } syntax-json-strings syntax-optional-catch-binding transform-parameters { ios, safari } syntax-async-generators syntax-object-rest-spread proposal-export-namespace-from { ios, safari } transform-modules-commonjs proposal-dynamic-import ... 

Removing this duplicate entry ensures the optimal application of transforms within the preset-env space. This was discovered while attempting to update react-native-svg, which has a pathologic case in their Symbol.tsx that causes a babel parser error that is resolved when this entry is removed:

Error: .../react-native-svg/src/elements/Symbol.tsx: We don't know what to do with this node type. We were previously a Statement but we can't fit in here? at NodePath.insertBefore (.../react-native-svg/node_modules/@babel/traverse/lib/path/modification.js:57:11) ... at async.call.result.err.err (.../react-native-svg/node_modules/gensync/index.js:223:11) { code: 'BABEL_TRANSFORM_ERROR' 

Test plan

I reproduced the minimal problem space at https://github.com/merrywhether/rnlib, and also verified that this allows react-native-svg to build against react-native-builder-bob@0.20.0 (after upgrading it from @react-native-community/bob@0.9.7).

Closes #154.
Unblocks software-mansion/react-native-svg#1993.

[satya164]

Thank you!