Move the Android "clear previous install" setting to Editor Settings

This means the setting now applies to every project deployed from
the editor, rather than being per-export preset.

platform/android/export/export.cpp

@@ -48,6 +48,8 @@ void register_android_exporter() {
 
 	EDITOR_DEF("export/android/shutdown_adb_on_exit", true);
 
+	EDITOR_DEF("export/android/one_click_deploy_clear_previous_install", false);
+
 	Ref<EditorExportPlatformAndroid> exporter = Ref<EditorExportPlatformAndroid>(memnew(EditorExportPlatformAndroid));
 	EditorExport::get_singleton()->add_export_platform(exporter);
 }