multi: remove legacy // +build tag Lines

With a upgrade to a never version of newer golang.org/x/tools/govet,
a lint check to check for legacy buildtag lines starting with
`// +build` has been added, as they're no longer needed.

In order for the `make lint` check to pass with the newer version, we
remove such buildtag lines.

app.go

@@ -1,5 +1,4 @@
 //go:build !litd_no_ui
-// +build !litd_no_ui
 
 package terminal
 

app_noui.go

@@ -1,5 +1,4 @@
 //go:build litd_no_ui
-// +build litd_no_ui
 
 package terminal
 

deps.go

@@ -1,5 +1,4 @@
 //go:build deps
-// +build deps
 
 package terminal
 

itest/litd_test_list_off_test.go

@@ -1,5 +1,4 @@
 //go:build !itest
-// +build !itest
 
 package itest
 

itest/litd_test_list_on_test.go

@@ -1,5 +1,4 @@
 //go:build itest
-// +build itest
 
 package itest
 

perms/mock.go

@@ -1,5 +1,4 @@
 //go:build !dev
-// +build !dev
 
 package perms
 

perms/mock_dev.go

@@ -1,5 +1,4 @@
 //go:build dev
-// +build dev
 
 package perms
 

tools/tools.go

@@ -1,5 +1,4 @@
 //go:build tools
-// +build tools
 
 package terminal