Fix signature confirmation PropType error (#10317)

Upon the first render, the "original" signature request confirmation
page would trigger a PropType error. This was caused by unexpected
mutation of the state props. The container has been updated to avoid
mutating the props, and now the PropType warning is no longer present.

ui/app/components/app/signature-request-original/signature-request-original.container.js

@@ -44,8 +44,7 @@ function mergeProps(stateProps, dispatchProps, ownProps) {
     txData,
   } = ownProps
 
-  const { allAccounts } = stateProps
-  delete stateProps.allAccounts
+  const { allAccounts, ...otherStateProps } = stateProps
 
   const {
     type,
@@ -69,7 +68,7 @@ function mergeProps(stateProps, dispatchProps, ownProps) {
 
   return {
     ...ownProps,
-    ...stateProps,
+    ...otherStateProps,
     ...dispatchProps,
     fromAccount,
     txData,