Remove unused dep @emeraldpay/hashicon-react (#4091)

Signed-off-by: Sebastian Malton <sebastian@malton.name>

package.json

@@ -253,7 +253,6 @@
     "ws": "^7.5.5"
   },
   "devDependencies": {
-    "@emeraldpay/hashicon-react": "^0.4.0",
     "@material-ui/core": "^4.12.3",
     "@material-ui/icons": "^4.11.2",
     "@material-ui/lab": "^4.0.0-alpha.60",