removes unnecessary minification for benchmark's debug flavor

benchmark/build.gradle

@@ -31,7 +31,7 @@ android {
         debug {
             // Since debuggable can"t be modified by gradle for library modules,
             // it must be done in a manifest - see src/androidTest/AndroidManifest.xml
-            minifyEnabled true
+            minifyEnabled false
             proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "benchmark-proguard-rules.pro"
         }
         release {