UI: Fix buttons changing minimum window width

UI/window-basic-main.cpp

@@ -1515,6 +1515,9 @@ void OBSBasic::ResetOutputs()
 				&QPushButton::clicked, this,
 				&OBSBasic::ReplayBufferClicked);
 
+			replayBufferButton->setSizePolicy(QSizePolicy::Ignored,
+							  QSizePolicy::Fixed);
+
 			replayLayout = new QHBoxLayout(this);
 			replayLayout->addWidget(replayBufferButton);