fix: remove event listener undefined error#1

tp26610 wants to merge 1 commit intomasterCoolBitX-Technology/NativeBase:masterfrom

fix/back-handler-remove-event-listener-undefined-error-on-rn-0.78CoolBitX-Technology/NativeBase:fix/back-handler-remove-event-listener-undefined-error-on-rn-0.78Copy head branch name to clipboard