Revert "Update unstripped native libs directory path for Crashlytics in build.gradle"

This reverts commit 1377c89.

Author: anhappdev

flutter/android/app/build.gradle

@@ -86,7 +86,7 @@ android {
                     println 'mappingFileUploadEnabled and nativeSymbolUploadEnabled set to true'
                     mappingFileUploadEnabled true
                     nativeSymbolUploadEnabled true
-                    unstrippedNativeLibsDir file("../../../flutter/build/app/intermediates/merged_native_libs/release")
+                    unstrippedNativeLibsDir file("../../../bazel-bin")
                 } else {
                     println 'mappingFileUploadEnabled and nativeSymbolUploadEnabled set to false'
                     mappingFileUploadEnabled false