fix(pick): update files picker with tool='git' to not quote paths

Details:
- Without extra `core.quotepath=false`, files with multibyte characters
  are shown differently: in `""` quotes and each byte shown separately.

Resolve #2188

Author: echasnovski

lua/mini/pick.lua

@@ -3406,7 +3406,9 @@ end
 H.files_get_command = function(tool)
   if tool == 'rg' then return { 'rg', '--files', '--color=never' } end
   if tool == 'fd' then return { 'fd', '--type=f', '--color=never' } end
-  if tool == 'git' then return { 'git', 'ls-files', '--cached', '--others', '--exclude-standard' } end
+  if tool == 'git' then
+    return { 'git', '-c', 'core.quotepath=false', 'ls-files', '--cached', '--others', '--exclude-standard' }
+  end
   H.error([[Wrong 'tool' for `files` builtin.]])
 end
 

tests/test_pick.lua

@@ -2714,7 +2714,7 @@ T['builtin.files()']['respects `local_opts.tool`'] = function()
 
   validate('rg', { '--files' })
   validate('fd', { '--type=f' })
-  validate('git', { 'ls-files', '--cached', '--others' })
+  validate('git', { '-c', 'core.quotepath=false', 'ls-files', '--cached', '--others', '--exclude-standard' })
 end
 
 T['builtin.files()']['has fallback tool'] = function()