Also fix versionName in example build.gradle.kts

[solsticedhiver]

There is a call to .toInteger() on flutter.versionCode in the example of build.gradle.kts

This does not seem right because that change throws an error when trying to build the app with that change.

Note: There is no such a call to .toInteger() with the build.gradle.kts created with flutter for a brand new app

Description of what this PR is changing or adding, and why:
Remove a call to to toInteger() for flutter.versionCode because it throws an error when building and does not seem necessary (builds fine without)

Issues fixed by this PR (if any):
See above

PRs or commits this PR depends on (if any):

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[gemini-code-assist]

Code Review

This pull request correctly fixes an issue in the Android deployment documentation where a code example for build.gradle.kts used invalid Groovy syntax (.toInteger()) within a Kotlin script context. The change removes this incorrect method call. My review includes a suggestion to further improve the example for consistency by using properties from the flutter Gradle extension, which aligns with other parts of the same code snippet and modern Flutter project configurations.

[solsticedhiver]

Oops I have signed the CLA after clicking the button. should be ok now