handle ; comments in variable definitions again

this is hacky but i don't wanna break existing code.
if you used // comments, then you'll have to change.

lips/Lexer.lua

@@ -410,7 +410,7 @@ function Lexer:lex(_yield)
             if self.chr == '@' then
                 -- old syntax; nothing to do here
             else
-                buff = self:read_chars('[^\n]')
+                buff = self:read_chars('[^;\n]')
                 yield('EXPR', buff)
             end
         elseif self.chr == ']' then