refactor(config): buildConfig 설정 위치 권장 설정 위치로 변경

- 기존: gradle.properties android.defaults.buildfeatures.buildconfig=true

- 변경: build.gradle buildFeatures { buildConfig = true }

app/build.gradle

@@ -21,6 +21,7 @@ android {
 
     buildFeatures {
         dataBinding true
+        buildConfig true
     }
 
     dependenciesInfo {

gradle.properties

@@ -22,6 +22,5 @@ kotlin.code.style=official
 # thereby reducing the size of the R class for that library
 org.gradle.configuration-cache=false
 android.nonTransitiveRClass=true
-android.defaults.buildfeatures.buildconfig=true
 android.enableJetifier=true
 android.nonFinalResIds=false