Center sign in popovers over the browser window so they are easily visible (#2457)

* Center sign in popovers in the browser window so they are always visible

* Set popover window feature by default using interfaced parameters

* Update snapshots to account for feature parameters on popup windows

* Lowercase the bar in menubar for Popup so it matches window api

* fix: externalized feature reconciliation

src/core/client/stream/common/UserBox/UserBoxContainer.tsx

@@ -127,7 +127,6 @@ export class UserBoxContainer extends Component<Props> {
         <Popup
           href={this.authUrl}
           title="Coral Auth"
-          features="menubar=0,resizable=0,width=350,height=450,top=100,left=500"
           open={open}
           focus={focus}
           onFocus={this.handleFocus}

src/core/client/stream/common/UserBox/__snapshots__/UserBoxContainer.spec.tsx.snap

@@ -3,7 +3,6 @@
 exports[`renders fully 1`] = `
 <React.Fragment>
   <Popup
-    features="menubar=0,resizable=0,width=350,height=450,top=100,left=500"
     focus={false}
     href="/embed/auth?view=SIGN_IN"
     onBlur={[Function]}
@@ -27,7 +26,6 @@ exports[`renders sso only without logout button 1`] = `null`;
 exports[`renders without logout button 1`] = `
 <React.Fragment>
   <Popup
-    features="menubar=0,resizable=0,width=350,height=450,top=100,left=500"
     focus={false}
     href="/embed/auth?view=SIGN_IN"
     onBlur={[Function]}
@@ -47,7 +45,6 @@ exports[`renders without logout button 1`] = `
 exports[`renders without register button 1`] = `
 <React.Fragment>
   <Popup
-    features="menubar=0,resizable=0,width=350,height=450,top=100,left=500"
     focus={false}
     href="/embed/auth?view=SIGN_IN"
     onBlur={[Function]}

src/core/client/stream/tabs/Profile/Settings/ChangePasswordContainer.tsx

@@ -53,7 +53,6 @@ const ChangePasswordContainer: FunctionComponent<Props> = ({
       <Popup
         href={`${urls.embed.auth}?view=${view}`}
         title="Coral Auth"
-        features="menubar=0,resizable=0,width=350,height=450,top=100,left=500"
         open={open}
         focus={focus}
         onFocus={onFocus}