Default to half-screen mode when filtering files or using the git-arg CLI arg

It should have been half-screen from the get-go. I think I just used
full-screen to make demos look nicer. Now that we have a CLI arg for the
screen mode we can make use of that in the demos.

pkg/integration/tests/demo/nuke_working_tree.go

@@ -7,7 +7,7 @@ import (
 
 var NukeWorkingTree = NewIntegrationTest(NewIntegrationTestArgs{
 	Description:  "Nuke the working tree",
-	ExtraCmdArgs: []string{"status"},
+	ExtraCmdArgs: []string{"status", "--screen-mode=full"},
 	Skip:         false,
 	IsDemo:       true,
 	SetupConfig: func(config *config.AppConfig) {