patch 8.2.1619: Vim9: cannot pass "true" to spellsuggest()

Problem:    Vim9: cannot pass "true" to spellsuggest().
Solution:   Use tv_get_bool_chk(). (closes #6883)

Author: brammool

src/evalfunc.c

@@ -7828,7 +7828,7 @@ f_spellsuggest(typval_T *argvars UNUSED, typval_T *rettv)
 		return;
 	    if (argvars[2].v_type != VAR_UNKNOWN)
 	    {
-		need_capital = (int)tv_get_number_chk(&argvars[2], &typeerr);
+		need_capital = (int)tv_get_bool_chk(&argvars[2], &typeerr);
 		if (typeerr)
 		    return;
 	    }

src/testdir/test_vim9_func.vim

@@ -1628,6 +1628,14 @@ def Test_setreg()
   assert_equal(reginfo, getreginfo('a'))
 enddef 
 
+def Test_spellsuggest()
+  if !has('spell')
+    MissingFeature 'spell'
+  else
+    spellsuggest('marrch', 1, true)->assert_equal(['March'])
+  endif
+enddef
+
 def Test_synID()
   new
   setline(1, "text")

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1619,
 /**/
     1618,
 /**/