Use root project build tools version if present (#691)

Co-authored-by: sgong-pdftron <sgong@apryse.com>

Author: markholland

android/build.gradle

@@ -28,7 +28,7 @@ apply plugin: 'kotlin-kapt'
 
 android {
  compileSdkVersion 33
- buildToolsVersion "30.0.2"
+ buildToolsVersion rootProject.hasProperty('buildToolsVersion') ? rootProject.buildToolsVersion : "30.0.2"
 
  defaultConfig {
  minSdkVersion 21