Reenable swap files, fix colorscheme setting

vimrc

@@ -14,7 +14,6 @@ set t_TI=""
 set t_TE=""
 set t_ut=""
 
-set noswapfile
 set updatetime=1000
 set signcolumn=yes
 
@@ -26,30 +25,11 @@ if executable('ag')
   let g:ackprg = 'ag --vimgrep'
 endif
 
-colorscheme onehalfdark
 if exists('+termguicolors') && ($COLORTERM == "24bit" || $COLORTERM == "truecolor")
-  let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
-  let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
   set termguicolors
-  let g:terminal_ansi_colors = [
-        \ '#282c34',
-        \ '#e06c75',
-        \ '#98c379',
-        \ '#e5c07b',
-        \ '#61afef',
-        \ '#c678dd',
-        \ '#56b6c2',
-        \ '#dcdfe4',
-        \ '#282c34',
-        \ '#e06c75',
-        \ '#98c379',
-        \ '#e5c07b',
-        \ '#61afef',
-        \ '#c678dd',
-        \ '#56b6c2',
-        \ '#dcdfe4'
-        \ ]
 endif
+colorscheme onehalfdark
+
 set cursorline
 set laststatus=2
 let mapleader=","