Update treesitter highlight groups + remove syntax error highlights (#232)

* Ignore highlight groups from the default treesitter config

https://github.com/nvim-treesitter/nvim-treesitter/blob/master/plugin/nvim-treesitter.vim

* Remove TSError highlight

I mistakenly thought the TSError highlight group was used for
highlighting error types. However upon further investigation into
https://github.com/dracula/vim/issues/231 I discovered it's actually
applied to syntax errors.

While typing out new code, treesitter is unable to parse the new code
and will highlight with TSError, in most cases we don't want that to
show up as an Error since we're not finished typing. See
https://github.com/nvim-treesitter/nvim-treesitter/issues/78#issuecomment-647140700
for more infomation.

after/plugin/dracula.vim

@@ -44,62 +44,31 @@ endif
 " Tree-sitter: {{{
 if exists('g:loaded_nvim_treesitter')
   " # Misc
-  hi! link TSError ErrorMsg
-  hi! link TSPunctDelimiter Delimiter
-  hi! link TSPunctBracket Normal
   hi! link TSPunctSpecial Special
   " # Constants
-  hi! link TSConstant Constant
-  hi! link TSConstBuiltin Constant
   hi! link TSConstMacro Macro
-  hi! link TSStringRegex String
-  hi! link TSString String
   hi! link TSStringEscape Character
   hi! link TSSymbol DraculaPurple
-  hi! link TSCharacter Character
-  hi! link TSNumber Number
-  hi! link TSBoolean Boolean
-  hi! link TSFloat Float
   hi! link TSAnnotation DraculaYellow
   hi! link TSAttribute DraculaGreenItalic
-  hi! link TSNamespace Structure
   " # Functions
   hi! link TSFuncBuiltin DraculaCyan
-  hi! link TSFunction Function
   hi! link TSFuncMacro Function
   hi! link TSParameter DraculaOrangeItalic
   hi! link TSParameterReference DraculaOrange
-  hi! link TSMethod Function
   hi! link TSField DraculaOrange
-  hi! link TSProperty Normal
   hi! link TSConstructor DraculaCyan
   " # Keywords
-  hi! link TSConditional Conditional
-  hi! link TSRepeat DraculaPink
   hi! link TSLabel DraculaPurpleItalic
-  hi! link TSKeyword Keyword
-  hi! link TSKeywordFunction DraculaCyan
-  hi! link TSKeywordOperator Operator
-  hi! link TSOperator Operator
-  hi! link TSException DraculaPurple
-  hi! link TSType Type
-  hi! link TSTypeBuiltin Type
-  hi! link TSStructure Structure
-  hi! link TSInclude Include
   " # Variable
-  hi! link TSVariable Normal
   hi! link TSVariableBuiltin DraculaPurpleItalic
   " # Text
-  hi! link TSText Normal
   hi! link TSStrong DraculaFgBold
   hi! link TSEmphasis DraculaFg
   hi! link TSUnderline Underlined
   hi! link TSTitle DraculaYellow
   hi! link TSLiteral DraculaYellow
   hi! link TSURI DraculaYellow
-  " # Tags
-  hi! link TSTag DraculaCyan
-  hi! link TSTagDelimiter Normal
 endif
 " }}}