Hide uninstall button for plugins that are not installed

src/manager-dialog.cpp

@@ -285,9 +285,9 @@ private:
 				&ManagerDialog::onInstallClicked);
 			m_table->setCellWidget(i, 3, btn);
 
+			if (pi->installed) {
 				auto *delBtn = new QPushButton(
 					de ? "Deinstallieren" : "Uninstall");
-			delBtn->setEnabled(pi->installed);
 				delBtn->setProperty("slug", QString(pi->slug));
 				delBtn->setStyleSheet(
 					"QPushButton { color: #cc3333; }");
@@ -296,6 +296,7 @@ private:
 				m_table->setCellWidget(i, 4, delBtn);
 			}
 		}
+	}
 
 	void onInstallClicked()
 	{