X11: When scrolling horizontally, primary mouse button events are constantly generated

Logitech MX Master 3 + side wheel + Ubuntu 20.04

I think

Lines 15 to 17 in a0cb3b0

    
           bool jwm::MouseButtonX11::isButton(uint32_t v) { 
        
               return v!=4 && v!=5; // mouse wheel buttons 
        
           }

should be extended to v<4 || v>7 - see this (happened to come across that while investigating #214)

	bool jwm::MouseButtonX11::isButton(uint32_t v) {
	return v!=4 && v!=5; // mouse wheel buttons
	}