Warning cleanup from the MSVC compile.

FossilOrigin-Name: 26cd015c0ee1c18dd37f11b47ce35cfa320b3514
diff --git a/src/resolve.c b/src/resolve.c
index 857b67d..4090bdd 100644
--- a/src/resolve.c
+++ b/src/resolve.c
@@ -261,7 +261,7 @@
             testcase( iCol==32 );
             pParse->oldmask |= (iCol>=32 ? 0xffffffff : (((u32)1)<<iCol));
           }
-          pExpr->iColumn = iCol;
+          pExpr->iColumn = (i16)iCol;
           pExpr->pTab = pTab;
           isTrigger = 1;
         }