Effect of Reduction on the State of the Surface Layer and Catalytic Properties of $${{{\text{Pt}}} \mathord{\left/ {\vphantom {{{\text{Pt}}} {{{{\text{WO}}_{4}^{{2 - }}} \mathord{\left/ {\vphantom {{{\text{WO}}_{4}^{{2 - }}} {{\text{Zr}}{{{\text{O}}}_{2}}}}} \right. \kern-0em} {{\text{Zr}}{{{\text{O}}}_{2}}}}}}} \right. \kern-0em} {{{{\text{WO}}_{4}^{{2 - }}} \mathord{\left/ {\vphantom {{{\text{WO}}_{4}^{{2 - }}} {{\text{Zr}}{{{\text{O}}}_{2}}}}} \right. \kern-0em} {{\text{Zr}}{{{\text{O}}}_{2}}}}}}$$ in the Hydroisomerization of an n-Heptane–Benzene Mixture