[gtksourceview] testsuite: remove use of meson 0.50 argument

[Christian Hergert <chergert src gnome org>]

commit 025672cfb6e98ccdcacaf17580ac9d10e5999884
Author: Christian Hergert <chergert redhat com>
Date:   Tue Apr 23 12:30:54 2019 -0700

    testsuite: remove use of meson 0.50 argument

 testsuite/meson.build | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/testsuite/meson.build b/testsuite/meson.build
index 3335bca2..e820a606 100644
--- a/testsuite/meson.build
+++ b/testsuite/meson.build
@@ -60,7 +60,6 @@ foreach test: testsuite_sources
               input: 'gtksourceview.test.in',
              output: '@0@.test'.format(test_name),
       configuration: test_t,
-            install: true,
         install_dir: testdatadir
     )
   endif