[gnome-calculator] Fixed compile error

[Robert Roth <robertroth src gnome org>]

commit 692504af5234c415255c614075a50a6f4025ce0f
Author: Robert Roth <robert roth off gmail com>
Date:   Mon Aug 1 10:23:05 2022 +0300

    Fixed compile error

 src/math-variable-popover.vala | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/src/math-variable-popover.vala b/src/math-variable-popover.vala
index 0514a121..d16eca32 100644
--- a/src/math-variable-popover.vala
+++ b/src/math-variable-popover.vala
@@ -47,7 +47,6 @@ public class MathVariablePopover : MathPopover<MathVariable>
         base(equation, model, (a,b) => MathVariable.name_compare_func(a as MathVariable,b as MathVariable));
 
         variable_list.bind_model (model, (variable) => make_item_row (variable as MathVariable));
-        changed_handler = variable_name_entry.changed.connect (variable_name_changed_cb);
         equation.history_signal.connect (this.handler);
         item_deleted.connect (delete_variable_cb);
     }