Fix a problem with upper case module names in the "sqldiff --vtab" command.

FossilOrigin-Name: 87e25fc472604b3978811be53991104c665a95e7
diff --git a/tool/sqldiff.c b/tool/sqldiff.c
index dbdf726..e92e8aa 100644
--- a/tool/sqldiff.c
+++ b/tool/sqldiff.c
@@ -1822,7 +1822,7 @@
     int rc;
   
     rc = sqlite3_exec(g.db, 
-        "CREATE TEMP TABLE tblmap(module, postfix);"
+        "CREATE TEMP TABLE tblmap(module COLLATE nocase, postfix);"
         "INSERT INTO temp.tblmap VALUES"
         "('fts3', '_content'), ('fts3', '_segments'), ('fts3', '_segdir'),"