patch 8.2.2552: Vim9: no reason to consider "{{{{{{{{" a command

Problem:    Vim9: no reason to consider "{{{{{{{{" a command.
Solution:   Just use "{". (issue #7904)

Author: brammool

src/ex_cmds.h

@@ -1819,7 +1819,7 @@ EXCMD(CMD_rshift,	">",		ex_operators,
 EXCMD(CMD_at,		"@",		ex_at,
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK|EX_NONWHITE_OK,
 	ADDR_LINES),
-EXCMD(CMD_block,	"{{{{{{{{",	ex_block,  // not found normally
+EXCMD(CMD_block,	"{",		ex_block,  // not found normally
 	0,
 	ADDR_NONE),
 EXCMD(CMD_endblock,	"}",		ex_endblock,

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2552,
 /**/
     2551,
 /**/