Mark debug build as actually debuggable

Author: mhagander

app/build.gradle

@@ -17,6 +17,7 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
         debug {
+            debuggable true
             minifyEnabled false
             shrinkResources false
         }