Fix bug to allow requesting tips again. Fix bug allowing chain selection on Mobile. Add Edgeware chain support

• Fixes bug that refreshed the game when user tried to submit the form on the Share & Request Tip page. It was due to poor logic where it was returning from the handleSubmit function because it was checking if both the mnemonic seed and chainAccount fields were provided, when only one would ever be provided depending on whether the user was playing on Desktop or Mobile
• Fixes bug where choose of chain wasn't displaying on Mobile devices, so user could only play on Kusama (default)
• Change default chain to Edgeware, since it supports the Contracts Runtime module, which is necessary for future leaderboard smart contract functionality
• Add support for Edgeware chain