ci: run all module tests in flipcash_tests lane

The lane previously only ran :app:flipcash:app:testDebug, missing
tests in shared modules, features, libs, and services. Run root
testDebug to cover all registered modules.

Author: bmc08gt

fastlane/Fastfile

@@ -31,7 +31,7 @@ platform :android do
   desc "Runs all the tests for Flipcash"
     lane :flipcash_tests do
       gradle(task: "generateEmojiList")
-      gradle(task: "app:flipcash:app:testDebug")
+      gradle(task: "testDebug")
     end
 
   desc "Runs all the tests for Flipcash2"