Fix TypeError when browserReload called without callback

[Copilot]

The browserReload function throws TypeError: r is not a function when invoked without a callback parameter, which can occur in certain gulp task compositions.

Changes

• Added type guard before invoking the done callback in browserReload

function browserReload(done) {
  server.reload();
  
  if (typeof done === 'function') {
    done();
  }
}

This makes the callback parameter effectively optional, preventing the error while maintaining backward compatibility with existing code that passes callbacks.

Original prompt

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This section details on the original issue you should resolve

<issue_title>TypeError: r is not a function</issue_title>
<issue_description>Despite the fact that it works just fine, while reloading it complains:

TypeError: r is not a function
at browserReload (./node_modules/@forward-software/gulp-browser-sync/dist/index.js:1:163)

So not exactly a bug but just FYI, cheers!
</issue_description>

<agent_instructions>The issue has been reported while using the gulp-browser-sync plugin.
Try to understand what the issue stems from and find a fix to avoid it, even if it's non-blocking.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes TypeError: r is not a function #71

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