Fix a bug such that different .env can be read according to android flavour (#195)

android/dotenv.gradle

@@ -33,7 +33,7 @@ def loadDotEnv(flavor = getCurrentFlavor()) {
     } else if (project.hasProperty("envConfigFiles")) {
         // use startsWith because sometimes the task is "generateDebugSources", so we want to match "debug"
         project.ext.envConfigFiles.any { pair ->
-            if (currentFlavor.startsWith(pair.key)) {
+            if (flavor.startsWith(pair.key)) {
                 envFile = pair.value
                 return true
             }