Fixup: Capture Tab for QLineEditKeyConfig, and don't enable Tab focus for it

src/citra_qt/config/QLineEditKeyConfig.cpp

@@ -27,3 +27,7 @@ void QLineEditKeyConfig::keyPressEvent(QKeyEvent* event) {
 
     emit ValueChanged(button, event->key());
 }
+
+bool QLineEditKeyConfig::focusNextPrevChild(bool next) {
+    return false;
+}

src/citra_qt/config/QLineEditKeyConfig.h

@@ -22,7 +22,7 @@ public:
     Settings::NativeInput::Values button;
     QLineEditKeyConfig(Settings::NativeInput::Values button, QWidget* parent = nullptr);
     void keyPressEvent(QKeyEvent* event) override;
-
+    bool focusNextPrevChild(bool next) override;
 signals:
     void ValueChanged(Settings::NativeInput::Values, int);
 };

src/citra_qt/config/inputs.cpp

@@ -21,6 +21,7 @@ GInputsDialog::GInputsDialog(QWidget* parent) : QDialog(parent) {
     // create the lineEdits
     for (int i = 0; i < Settings::NativeInput::NUM_INPUTS; ++i) {
         lineEdits[i] = new QLineEditKeyConfig(Settings::NativeInput::All[i]);
+        lineEdits[i]->setFocusPolicy(Qt::ClickFocus);
     }
 
     // put the lineEdits and their labels into a grid