fix: add missing delay between clicks in MouseDClick()

[Dabao21]

Problem

In memory/ljqCtrl.py, MouseDClick() fires two rapid click events without any delay between MouseDown() and MouseUp():

def MouseDClick(staytime=0.05):
    MouseDown(); MouseUp() 
    MouseDown(); MouseUp() 
    time.sleep(0.05)

Compare with MouseClick() which has time.sleep(staytime) between down/up. Without this delay, the OS may interpret the two rapid clicks as a single long press rather than a double-click, making MouseDClick() unreliable.

Fix

Add time.sleep(staytime) between each MouseDown()/MouseUp() pair, and time.sleep(0.05) between the two clicks, matching MouseClick() behavior:

def MouseDClick(staytime=0.05):
    MouseDown(); time.sleep(staytime); MouseUp(); time.sleep(0.05)
    MouseDown(); time.sleep(staytime); MouseUp(); time.sleep(0.05)

Impact

• Double-click operations now work reliably on Windows
• Behavior is consistent with MouseClick() implementation