Modified plugin file: wp-content/plugins/wp-pagenavi/core.php

Plugin Version: 2.91
I dont recall updating this product recently , yet Wordfense keeps red flagging file changes thus:
line 128 has been removed from my installed version version
‘title’ => sprintf( __( ‘Page %d’, ‘wp-pagenavi’ ), number_format_i18n( $larger_page ) ),

line 147 also removed from my version
‘title’ => sprintf( __( ‘Page %d’, ‘wp-pagenavi’ ), number_format_i18n( $i ) ),

line 159 removed from my version
‘title’ => sprintf( __( ‘Page %d’, ‘wp-pagenavi’ ), number_format_i18n( $larger_page ) ),

Q. Should I restore the version in the repository or keep these amendments?