Fix Calc menu item for vector dot products

* lisp/calc/calc-menu.el (calc-vectors-menu): Use the correct
function `calc-times' instead of the non-existent `calc-mult'
function (bug#46710).

lisp/calc/calc-menu.el

@@ -781,7 +781,7 @@
                :active (>= (calc-stack-size) 2)
                :help "The cross product in R^3"]
               ["(2:) dot (1:)"
-               calc-mult
+               calc-times
                :keys "*"
                :active (>= (calc-stack-size) 2)
                :help "The dot product"]