tc/lexer: let quotes actually start strings

The lexer will go with the longest match, so previously
the starting double quotes of a string would be swallowed by
the [^ \t\r\n()]+ pattern leaving the user no way to
actually use strings with escape sequences.
Fix this by not allowing this case to start with double
quotes.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

tc/emp_ematch.l

@@ -137,7 +137,7 @@
 ")"					{
 						return yylval.i = *yytext;
 					}
-[^ \t\r\n()]+				{
+[^" \t\r\n()][^ \t\r\n()]*		{
 						yylval.b = bstr_alloc(yytext);
 						if (yylval.b == NULL)
 							return ERROR;