QmlProfiler: Make message boxes always 300 pixels wide.

Sometimes the text would not fit and constantly resizing them is ugly
anyway.

Change-Id: Id1136ae3b2d2f339ff6f4302b45794201221e6c4
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

src/plugins/qmlprofiler/qmlprofilerstatewidget.cpp

@@ -200,7 +200,7 @@ void QmlProfilerStateWidget::showText(const QString &text, bool showProgress)
     }
     d->progressBar->setVisible(showProgress);
     d->text->setText(text);
-    resize(showProgress ? 300 : 200, 70);
+    resize(300, 70);
     reposition();
 }