Add write support for workram-copy

src/interconnect.rs

@@ -344,6 +344,9 @@ impl Interconnect {
             0xD000..=0xDFFF => {
                 self.ram[(addr - 0xD000) as usize + self.wram_bank as usize * 0x1000] = val;
             }
+            0xE000..=0xFCFF => {
+                self.ram[(addr - 0xE000) as usize] = val;
+            }
             0xFE00..=0xFE9F => self.display.write_byte(addr, val), // OAM
             0xFF00 => {
                 // Joystick select