fix(libsearch):解决加载svg（绝对路径的图片）图标失败的问题

libsearch/icon-loader.cpp

@@ -22,12 +22,21 @@
 #include <QMutex>
 #include <QMutexLocker>
 #include <XdgIcon>
+#include <QFile>
 namespace UkuiSearch {
 static QMutex qtIconMutex;
 static QMutex xdgIconMutex;
 QIcon IconLoader::loadIconQt(const QString &name, const QIcon &fallback)
 {
     QMutexLocker locker(&qtIconMutex);
+    if(QFile::exists(name)) {
+        QIcon icon(name);
+        if(!QIcon(name).isNull()) {
+            return icon;
+        } else {
+            return fallback;
+        }
+    }
     return QIcon::fromTheme(name,fallback);
 }