patch 8.0.1057: terminal scrape test waits too long

Problem:    Terminal scrape test waits too long, it checks for one instead of
            three.
Solution:   Check there are three characters. (micbou)

Author: brammool

src/testdir/test_terminal.vim

@@ -166,8 +166,8 @@ func Test_terminal_scrape_123()
   call term_wait(buf)
   let g:buf = buf
   " On MS-Windows we first get a startup message of two lines, wait for the
-  " "cls" to happen, after that we have one line.
-  call WaitFor('len(term_scrape(g:buf, 1)) == 1')
+  " "cls" to happen, after that we have one line with three characters.
+  call WaitFor('len(term_scrape(g:buf, 1)) == 3')
   call Check_123(buf)
 
   " Must still work after the job ended.

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1057,
 /**/
     1056,
 /**/