Fix scope string format

According to the OAuth spec, the scopes have to be in a space separated string. Fixing this resolves failing Google login.

Author: gvillenave

android/src/main/java/io/fullstack/oauth/OAuthManagerProviders.java

@@ -264,13 +264,13 @@ private static ServiceBuilder _oauth2ServiceBuilder(
     String scopes = "";
     if (cfg.containsKey("scopes")) {
       scopes = (String) cfg.get("scopes");
-      String scopeStr = OAuthManagerProviders.getScopeString(scopes, ",");
+      String scopeStr = OAuthManagerProviders.getScopeString(scopes, " ");
       builder.scope(scopeStr);
     }
 
     if (opts != null && opts.hasKey("scopes")) {
       scopes = (String) opts.getString("scopes");
-      String scopeStr = OAuthManagerProviders.getScopeString(scopes, ",");
+      String scopeStr = OAuthManagerProviders.getScopeString(scopes, " ");
       builder.scope(scopeStr);
     }
 
@@ -288,7 +288,7 @@ private static String getScopeString(
     final String scopes,
     final String joinBy
   ) {
-    List<String> array = Arrays.asList(scopes.replaceAll("\\s", "").split("[ ,]+"));
+    List<String> array = Arrays.asList(scopes.replaceAll("\\s", "").split(","));
     Log.d(TAG, "array: " + array + " (" + array.size() + ") from " + scopes);
     return TextUtils.join(joinBy, array);
   }