nvim: lua: plugins: No need to specify branch anymore

With this commit upstream
a68b21be60

packer can handle finding default branches by itself and does not error
out like earlier for anything named other than master.

nvim/.config/nvim/lua/plugins.lua

@@ -43,8 +43,7 @@ local init = function ()
   use 'nvim-lua/plenary.nvim'
   use {
     'lewis6991/gitsigns.nvim',
-    config =  "require('modules.gitsigns')",
-    branch = 'main'
+    config =  "require('modules.gitsigns')"
   }
   use 'lambdalisue/gina.vim'
   use 'rhysd/git-messenger.vim'
@@ -154,7 +153,6 @@ local init = function ()
   -- For statusline
   use {
     'glepnir/galaxyline.nvim',
-    branch = 'main',
     config = "require('modules.statusline')",
     requires = { 'kyazdani42/nvim-web-devicons' }
   }