Fix VIM cw on last character of a word doesn't work as expected: (#10963)

At the moment, using the default expand_selection seems to do the job
well, without the need for some additional logic, which may also make
the code a little clearer, Fix #10945



Release Notes:


- N/A

crates/vim/test_data/test_change_w.json

@@ -10,6 +10,10 @@
 {"Key":"c"}
 {"Key":"w"}
 {"Get":{"state":"Testˇtest","mode":"Insert"}}
+{"Put":{"state":"Tesˇt  test"}}
+{"Key":"c"}
+{"Key":"w"}
+{"Get":{"state":"Tesˇ  test","mode":"Insert"}}
 {"Put":{"state":"Test teˇst\ntest"}}
 {"Key":"c"}
 {"Key":"w"}