UI: Allow custom browser delete button to fill the cell

UI/data/themes/Acri.qss

@@ -937,6 +937,10 @@ QHeaderView::section {
     border: 1px solid #333336;
     border-left: none;
 }
+*[themeID="trashIcon"] {
+    margin: 0;
+}
+
 /* Locked CheckBox */
 
 LockedCheckBox {

UI/window-extra-browsers.cpp

@@ -138,7 +138,7 @@ void ExtraBrowsersModel::AddDeleteButton(int idx)
 	QPushButton *del = new DelButton(index);
 	del->setProperty("themeID", "trashIcon");
 	del->setObjectName("extraPanelDelete");
-	del->setFixedSize(QSize(20, 20));
+	del->setMinimumSize(QSize(20, 20));
 	connect(del, &QPushButton::clicked, this,
 		&ExtraBrowsersModel::DeleteItem);