fix: hide BrowserWindows before showing dialog

on linux we show webui on startup because tray icon is not always
available, and showDialog's blocking nature freezes it mid-load.

What is worse, that broken BrowserWindow may be on top of the dialog,
leaving user confused why everything froze.

This solves the problem by hiding all windows before showing the final
dialog

assets/locales/en.json

@@ -208,7 +208,7 @@
     "message": "IPFS node has encountered an error and startup could not be completed:"
   },
   "invalidRepositoryDialog": {
-    "title": "Invalid Repository",
-    "message": "The repository at { path } is invalid. The configuration file .ipfs/config must be a valid JSON file.\n\nBefore starting IPFS Desktop again, please fix the configuration file or rename the old repository to .ipfs.backup."
+    "title": "Invalid IPFS Repository or Configuration File",
+    "message": "The repository at “{ path }” is invalid. The “config” file must be a valid JSON.\n\nBefore starting IPFS Desktop again, please fix the configuration file or rename the old repository to “.ipfs.backup”."
   }
 }

src/daemon/config.js

@@ -1,4 +1,4 @@
-const { app } = require('electron')
+const { app, BrowserWindow } = require('electron')
 const { join } = require('path')
 const fs = require('fs-extra')
 const { multiaddr } = require('multiaddr')
@@ -339,12 +339,20 @@ function checkValidConfig (ipfsd) {
     readConfigFile(ipfsd)
     return true
   } catch (e) {
+    // Save to error.log
+    logger.error(e)
+
+    // Hide other windows so the user focus in on the dialog
+    BrowserWindow.getAllWindows().forEach(w => w.hide())
+
+    // Show blocking dialog
     showDialog({
       title: i18n.t('invalidRepositoryDialog.title'),
       message: i18n.t('invalidRepositoryDialog.message', { path: ipfsd.path }),
       buttons: [i18n.t('quit')]
     })
 
+    // Only option is to quit
     app.quit()
   }
 }