fix: add missing scalars converter dependency for androidTest

TronBalancesIntegrationTest.kt uses ScalarsConverterFactory but nothing in
app/build.gradle declared it, so the app module's androidTest compilation
failed with "Unresolved reference 'scalars'" - this was never caught before
now because the emulator balances_test.yml workflow only runs on a schedule/
manual dispatch, not on every push.

app/build.gradle

@@ -324,6 +324,7 @@ dependencies {
     androidTestImplementation androidTestRunnerDep
     androidTestImplementation androidTestRulesDep
     androidTestImplementation androidJunitDep
+    androidTestImplementation scalarsConverterDep
 
     androidTestImplementation allureKotlinModel
     androidTestImplementation allureKotlinCommons