fix(chattextedit.cpp): fix drag-and-drop to be consistent across systems

Add explicit setAcceptDrops(false) to allow parent widget to handle
drag-and-drops consistently across various desktop environments.

Closes: #2847

src/widget/tool/chattextedit.cpp

@@ -26,6 +26,7 @@ ChatTextEdit::ChatTextEdit(QWidget *parent) :
 {
     retranslateUi();
     setAcceptRichText(false);
+    setAcceptDrops(false);
 
     Translator::registerHandler(std::bind(&ChatTextEdit::retranslateUi, this), this);
 }