Remove deprecated GenerateStatusline() function

autoload/tagbar.vim

@@ -3653,22 +3653,6 @@ function! TagbarBalloonExpr() abort
     return taginfo.getPrototype(0)
 endfunction
 
-" TagbarGenerateStatusline() {{{2
-function! TagbarGenerateStatusline() abort
-    if get(s:compare_typeinfo, 'sort', g:tagbar_sort)
-        let text = '[Name]'
-    else
-        let text = '[Order]'
-    endif
-
-    if !empty(s:known_files.getCurrent())
-        let filename = fnamemodify(s:known_files.getCurrent().fpath, ':t')
-        let text .= ' ' . filename
-    endif
-
-    return text
-endfunction
-
 " Debugging {{{1
 " s:StartDebug() {{{2
 function! s:StartDebug(filename) abort