fix(math_i): missing backslash in left right braces

Author: iurimateus

lua/luasnip-latex-snippets/math_i.lua

@@ -48,10 +48,9 @@ local math_i = {
     { trig = "lr|", name = "left| right|" },
     "\\left| ${1:${TM_SELECTED_TEXT}} \\right| $0"
   ),
-  -- ls.parser.parse_snippet({ trig = "lrb", name = "left{ right}" }, "\\left{ ${1:${TM_SELECTED_TEXT}} \\right} $0"),
   ls.parser.parse_snippet(
     { trig = "lr{", name = "left{ right}" },
-    "\\left{ ${1:${TM_SELECTED_TEXT}} \\right} $0"
+    "\\left\\{ ${1:${TM_SELECTED_TEXT}} \\right\\\\} $0"
   ),
   ls.parser.parse_snippet(
     { trig = "lr[", name = "left[ right]" },