Fix [ \( str -a str \) ], [ \( str -o str \) ]

Symptoms:

$ test \( string1 -a string2 \)
/usr/local/bin/ksh: test: argument expected
$ test \( string1 -o string2 \)
/usr/local/bin/ksh: test: argument expected

The parentheses should be irrelevant and this should be a test for
the non-emptiness of string1 and/or string2.

src/cmd/ksh93/bltins/test.c:

- b_test(): There is a block where the case of 'test' with five or
  less arguments, the first and last one being parentheses, is
  special-cased. The parentheses are removed as a workaround: argv
  is increased to skip the opening parenthesis and argc is
  decreased by 2. However, there is no corresponding increase of
  tdata.av which is a copy of this function's argv. This renders
  the workaround ineffective. The fix is to add that increase.

- e3(): Do not handle '!' as a negator if not followed by an
  argument. This allows a right-hand expression that is equal to
  '!' (i.e. a test for the non-emptiness of the string '!').

src/cmd/ksh93/data/testops.c

@@ -57,7 +57,7 @@ const Shtable_t shtab_testops[] =
 };
 
 const char sh_opttest[] =
-"[-1c?\n@(#)$Id: test (ksh 93u+m) 2021-11-13 $\n]"
+"[-1c?\n@(#)$Id: test (ksh 93u+m) 2021-11-14 $\n]"
 "[--catalog?" SH_DICT "]"
 "[+NAME?test, [ - evaluate expression]"
 "[+DESCRIPTION?\btest\b evaluates expressions and returns its result using the "