fix: nkdversion -> ndkVersion casing in gradle.properties (#744)

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### Summary

I think this was a typo? Otherwise it wouldn't match with [this
line](https://github.com/callstack/react-native-builder-bob/blob/87b0032acd66b7b14a5b358117a3d1497c59baad/packages/create-react-native-library/templates/native-common/android/build.gradle#L62)?

### Test plan

–

Author: KiwiKilian

packages/create-react-native-library/templates/native-common/android/gradle.properties

@@ -2,4 +2,4 @@
 <%- project.name -%>_minSdkVersion=24
 <%- project.name -%>_targetSdkVersion=34
 <%- project.name -%>_compileSdkVersion=35
-<%- project.name -%>_ndkversion=27.1.12297006
+<%- project.name -%>_ndkVersion=27.1.12297006