Change 'Build Project' button style in Mono panel

Address #15208

modules/mono/editor/mono_bottom_panel.cpp

@@ -197,7 +197,7 @@ MonoBottomPanel::MonoBottomPanel(EditorNode *p_editor) {
 		toolbar_hbc->set_h_size_flags(SIZE_EXPAND_FILL);
 		panel_builds_tab->add_child(toolbar_hbc);
 
-		ToolButton *build_project_btn = memnew(ToolButton);
+		Button *build_project_btn = memnew(Button);
 		build_project_btn->set_text(TTR("Build Project"));
 		build_project_btn->set_focus_mode(FOCUS_NONE);
 		build_project_btn->connect("pressed", this, "_build_project_pressed");