King Charles’ cancer battle is causing royal experts to wonder if Prince Harry will put his pride aside to mend his feud with his father. The Duke of Sussex visited Charles shortly after he was diagnosed with the condition, and he will see His Majesty in May during his upcoming U.K. appearance. “Harry is scheduled to speak at St Paul’s Cathedral in London on May 8 to mark the 10th anniversary of the Invictus Games,” Tom Quinn told an outlet. “The Games were founded by Harry when he was still a working royal so pressure isn’t being brought to bear to make him give it up now.” “But even if Harry…