Add block dialog fails to show strategies and functions

[murderteeth]

The add block dialog fails to show strategies and functions after I've been using it for several minutes. I noticed the same thing happening on the vault harvest page. After the app's been open a bit, I start getting websocket errors in the console:

WebSocket is already in CLOSING or CLOSED state.

To reproduce:

• Sandbox
• Add block
• Wait several minutes
• Select any vault

[murderteeth]

fixed by #63