fix(auth): use auth flow type correctly from amplifyconfiguraiton.jso… #435

Job	Run time
Build Amplify Swift for iOS / Build Amplify-Build \| iOS	10m 33s
Build Amplify Swift for macOS / Build Amplify-Build \| macOS	7m 26s
Build Amplify Swift for tvOS / Build Amplify-Build \| tvOS	5m 56s
Build Amplify Swift for watchOS / Build Amplify-Build \| watchOS	10m 57s
Confirm Passing Build Steps	1s
	34m 53s

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