Show the TK_DOT operator in the TreeView debugging output.
No changes to production code.

FossilOrigin-Name: 07c89940c49a5dca3205a4b6fa8290f23bcb6e10
diff --git a/src/expr.c b/src/expr.c
index 31ff98e..1ad9a87 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -3339,6 +3339,7 @@
     case TK_LSHIFT:  zBinOp = "LSHIFT"; break;
     case TK_RSHIFT:  zBinOp = "RSHIFT"; break;
     case TK_CONCAT:  zBinOp = "CONCAT"; break;
+    case TK_DOT:     zBinOp = "DOT";    break;
 
     case TK_UMINUS:  zUniOp = "UMINUS"; break;
     case TK_UPLUS:   zUniOp = "UPLUS";  break;