Fix defaults (#510)

* Fix defaults

* Use '' as default for androidExportType

action.yml

@@ -53,7 +53,7 @@ inputs:
     description: '[Deprecated] Use androidExportType instead. Whether to build .aab instead of .apk'
   androidExportType:
     required: false
-    default: 'androidPackage'
+    default: ''
     description:
       'The android export type. Should be androidPackage for apk, androidAppBundle for aab, or androidStudioProject for
       an android studio project.'
@@ -83,11 +83,11 @@ inputs:
     description: 'The android target API level.'
   androidSymbolType:
     required: false
-    default: 'none'
+    default: 'public'
     description: 'The android symbol type to export. Should be "none", "public" or "debugging".'
   sshAgent:
     required: false
-    default: 'public'
+    default: ''
     description: 'SSH Agent path to forward to the container'
   gitPrivateToken:
     required: false