LCL: Do not force-clear mouse capture flag on creation of TCustomEdit and TCustomComboBox, issue #40379.

Fixes text selection of TEdit and TComboBox on Gtk2 widgetset.

This effectively reverts the following commits:

Commit 27d0c29fb7 (introduced long time
ago to workaround Qt* widgetsets problems, which will be fixed
separately).

Commit e4494cf4cd (workaround for Gtk2
problems caused by the first one).

lcl/include/customcombobox.inc

@@ -891,7 +891,6 @@ begin
   inherited Create(TheOwner);
 
   fCompStyle := csComboBox;
-  ControlStyle := ControlStyle - [csCaptureMouse];
   with GetControlClassDefaultSize do
     SetInitialBounds(0, 0, CX, CY);
   FItems := TStringListUTF8Fast.Create;

lcl/include/customedit.inc

@@ -68,7 +68,7 @@ begin
   inherited Create(AOwner);
   //FCompStyle is set here because TEdit inherits from this.
   //TCustomMemo also inherits from here but it's create changes fcompstyle to csMemo
-  ControlStyle := ControlStyle - [csCaptureMouse] + [csRequiresKeyboardInput];
+  ControlStyle := ControlStyle + [csRequiresKeyboardInput];
   FCompStyle := csEdit;
   FMaxLength := 0;
   FHideSelection := True;

lcl/interfaces/gtk2/gtk2callback.inc

@@ -1529,7 +1529,7 @@ begin
   if not (csDesigning in ACtl.ComponentState) and
      not (csCaptureMouse in ACtl.ControlStyle) and
     ([ssLeft,ssRight,ssMiddle]*ShiftState <> []) and
-    not (ACtl is TCustomForm) and not (ACtl is TScrollBar) and not (ACtl is TCustomEdit)
+    not (ACtl is TCustomForm) and not (ACtl is TScrollBar)
     and not DragManager.IsDragging then
   begin
     if (Event^.x < 0) or (Event^.y < 0) or