vimrc: update fugitive settings

vimrc

@@ -171,13 +171,7 @@ nmap <leader>gg :Rg<cr>
 
 " Lightline configuration:
 packadd! lightline.vim
-function! GitHead()
-  let l:head = FugitiveHead()
-  if l:head == ''
-    return ''
-  endif
-  return '[' . l:head . ']'
-endfunction
+set laststatus=2
 
 function! LightlineLSPErrorText()
   let l:info = lsp#get_buffer_diagnostics_counts()
@@ -197,7 +191,6 @@ function! LightlineLSPWarningText()
   return info.warning . sign
 endfunction
 
-set laststatus=2
 let g:lightline = {
       \ 'colorscheme': 'seoul256',
       \ 'active': {
@@ -208,7 +201,7 @@ let g:lightline = {
       \ },
       \ 'component_function': {
       \   'gobuild': 'go#statusline#Show',
-      \   'gitbranch': 'GitHead',
+      \   'gitbranch': 'FugitiveStatusline',
       \ },
       \ 'component_expand': {
       \   'lsperror': 'LightlineLSPErrorText',
@@ -283,6 +276,8 @@ let g:lsp_diagnostics_float_cursor = 1
 function! s:on_lsp_buffer_enabled() abort
     setlocal omnifunc=lsp#complete
     setlocal signcolumn=yes
+    " number may be clobbered by vim-fugitive?
+    setlocal number
 
     " Jump to definitions
     nmap <buffer> gd <plug>(lsp-definition)