Set clearLogs accelerator for log-rendering plugins

Summary:
Sets a default key binding of `ctrl+l` to clear the screen within built-in Flipper plugins which display a log view.

Motivation: A small quality of life improvement for developers used to the default "clear screen" binding. This makes our log-rendering plugins consistent with other native apps such as terminals, Chrome DevTools, and many others.

Reviewed By: mweststrate

Differential Revision: D37782638

fbshipit-source-id: 0a85b930faaa0e9468d5391f15092aad7b6057ee

desktop/plugins/public/logs/index.tsx

@@ -139,6 +139,7 @@ export function devicePlugin(client: DevicePluginClient) {
     {
       action: 'clear',
       handler: clearLogs,
+      accelerator: 'ctrl+l',
     },
     {
       action: 'createPaste',