fix(onboarding): default to create new wallet

It is more common for new users to create a new wallet than to import
an existing one. Make the "create new wallet" option the default
selected value in the onboarding process.

app/reducers/onboarding.js

@@ -424,7 +424,7 @@ const initialState = {
   recoverSeedInput: [],
   // step where the user decides whether they want a newly created seed or to import an existing one
   signupForm: {
-    create: false,
+    create: true,
     import: false
   },