[gnote] Replace deprecated margin_left with margin_start

[Aurimas Černius <aurimasc src gnome org>]

commit 6973cd0bbca3f34135b4093357050b1fd32b8496
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Mon May 10 23:03:15 2021 +0300

    Replace deprecated margin_left with margin_start

 src/notewindow.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/notewindow.cpp b/src/notewindow.cpp
index 5be43198..e60513d4 100644
--- a/src/notewindow.cpp
+++ b/src/notewindow.cpp
@@ -401,13 +401,13 @@ namespace gnote {
     text_button->set_image(*image);
     text_button->signal_clicked()
       .connect(sigc::mem_fun(*this, &NoteWindow::on_text_button_clicked));
-    text_button->property_margin_left() = 12;
+    text_button->property_margin_start() = 12;
     text_button->show_all();
     grid->attach(*text_button, grid_col++, 0, 1, 1);
     text_button->set_tooltip_text(_("Set properties of text"));
     m_text_menu->set_relative_to(*text_button);
 
-    grid->property_margin_left() = 12;
+    grid->property_margin_start() = 12;
     grid->show_all();
     return grid;
   }