main: Globally disable the "?" button on dialogs

Sets the AA_DisableWindowContextHelpButton attribute to disable this useless button globally.

src/yuzu/util/limitable_input_dialog.cpp

@@ -16,8 +16,6 @@ LimitableInputDialog::LimitableInputDialog(QWidget* parent) : QDialog{parent} {
 LimitableInputDialog::~LimitableInputDialog() = default;
 
 void LimitableInputDialog::CreateUI() {
-    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
-
     text_label = new QLabel(this);
     text_entry = new QLineEdit(this);
     text_label_invalid = new QLabel(this);

src/yuzu/util/sequence_dialog/sequence_dialog.cpp

@@ -8,7 +8,6 @@
 
 SequenceDialog::SequenceDialog(QWidget* parent) : QDialog(parent) {
     setWindowTitle(tr("Enter a hotkey"));
-    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 
     key_sequence = new QKeySequenceEdit;