Correct themeLabel in package.nls.json for "Tomorrow Night Blue" theme

Fix themeLabel value in package.nls.json for "Tomorrow Night Blue" theme

Incorrect value "Quiet Light" commited in 183b2a28

extensions/theme-tomorrow-night-blue/package.nls.json

 {
 	"displayName": "Tomorrow Night Blue Theme",
 	"description": "Tomorrow night blue theme for Visual Studio Code",
-	"themeLabel": "Quiet Light"
+	"themeLabel": "Tomorrow Night Blue"
 }