Fix another typo in ToUnicode template constant

The CMapType key in the CMap resource dictionary is missing a slash.

Change-Id: I5269815a172446241e52053577a086ae60304a1e
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/116050
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Thomas Sepez <tsepez@google.com>
Commit-Queue: Lei Zhang <thestig@chromium.org>

fpdfsdk/fpdf_edittext.cpp

diff --git a/fpdfsdk/fpdf_edittext.cpp b/fpdfsdk/fpdf_edittext.cpp
index 4de39a6..1792b29 100644
--- a/fpdfsdk/fpdf_edittext.cpp
+++ b/fpdfsdk/fpdf_edittext.cpp
@@ -238,7 +238,7 @@
     "/Supplement 0\n"
     ">> def\n"
     "/CMapName /Adobe-Identity-H def\n"
-    "CMapType 2 def\n"
+    "/CMapType 2 def\n"
     "1 begincodespacerange\n"
     "<0000> <FFFF>\n"
     "endcodespacerange\n";