Don't steal focus from the user for the solution explorer

Author: TheAngryByrd

release/package.json

@@ -829,7 +829,7 @@
           "type": "boolean"
         },
         "FSharp.showExplorerOnStartup": {
-          "default": true,
+          "default": false,
           "description": "Automatically shows solution explorer on plugin startup",
           "type": "boolean"
         },

src/fsharp.fs

@@ -36,7 +36,7 @@ let private activateLanguageServiceRestart (context: ExtensionContext) =
 let activate (context: ExtensionContext) : JS.Promise<Api> =
     let solutionExplorer = "FSharp.enableTreeView" |> Configuration.get true
 
-    let showExplorer = "FSharp.showExplorerOnStartup" |> Configuration.get true
+    let showExplorer = "FSharp.showExplorerOnStartup" |> Configuration.get false
 
     let tryActivate label activationFn =
         fun ctx ->