Revert "Don't tear down renderer and other busy work when Svg::setImagePath is invoked with the same arg"

This reverts commit 4ce50cc61f.

This caused a regression with toggling compositing, causing SVG reloads
with the same path to switch to opague elements. As this revision was
meant as a performance optimization, it can be reverted with no other
consequence for now.

src/plasma/private/svg_p.h

@@ -104,7 +104,6 @@ public:
     QHash<QString, QRectF> localRectCache;
     QHash<QString, QSize> elementsWithSizeHints;
     SharedSvgRenderer::Ptr renderer;
-    QString requestedPath;
     QString themePath;
     QString path;
     QSizeF size;

src/plasma/svg.cpp

@@ -182,12 +182,6 @@ QString SvgPrivate::cachePath(const QString &path, const QSize &size) const
 
 bool SvgPrivate::setImagePath(const QString &imagePath)
 {
-    if (requestedPath == imagePath) {
-        return false;
-    }
-
-    requestedPath = imagePath;
-
     QString actualPath = imagePath;
     if (imagePath.startsWith(QLatin1String("file://"))) {
         //length of file://