Flash prevention plugin should not set 'display: inherit' on loaded

[puku0x]

🐞 Bug report

Description

The following css is added when the app using scully-plugin-flash-prevention has been loaded.

body.loaded app-root {
    display: inherit;
}

display: inherit; changes the layout when app-root has display: gird; like Scully's blog sample.

🔬 Minimal Reproduction

💻Your Environment

Angular Version:

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 9.1.7
Node: 12.16.3
OS: darwin x64

Angular: 9.1.9
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router
Ivy Workspace: Yes

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.901.4
@angular-devkit/build-angular      0.901.7
@angular-devkit/build-ng-packagr   0.901.7
@angular-devkit/build-optimizer    0.901.7
@angular-devkit/build-webpack      0.901.7
@angular-devkit/core               9.1.4
@angular-devkit/schematics         9.1.4
@angular/cli                       9.1.7
@ngtools/webpack                   9.1.7
@schematics/angular                9.1.7
@schematics/update                 0.901.7
ng-packagr                         9.1.3
rxjs                               6.5.5
typescript                         3.8.3
webpack                            4.42.0

Scully Version:

@scullyio/scully@master