[gtranslator] Removed gtr-plugins.page reference from meson

[Daniel Mustieles García <dmustieles src gnome org>]

commit ea4659e2236ae2c1f02906894a200f11a540062b
Author: Daniel Mustieles <daniel mustieles contractor bbva com>
Date:   Mon Sep 30 12:46:18 2019 +0200

    Removed gtr-plugins.page reference from meson
    
    This file has been removed so this reference must be also removed to avoid errors when 
compiling/installing this module

 help/meson.build | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/help/meson.build b/help/meson.build
index 548e6fea..bb7e7211 100644
--- a/help/meson.build
+++ b/help/meson.build
@@ -9,7 +9,6 @@ sources = [
   'gtr-join-users.page',
   'gtr-main-window.page',
   'gtr-open-po.page',
-  'gtr-plugins.page',
   'gtr-profiles.page',
   'gtr-quickstart.page',
   'gtr-report-problem.page',