Clean up header inclusion

src/gui/addnewtorrentdialog.ui

@@ -435,12 +435,12 @@
   <customwidget>
    <class>TorrentContentTreeView</class>
    <extends>QTreeView</extends>
-   <header>torrentcontenttreeview.h</header>
+   <header>gui/torrentcontenttreeview.h</header>
   </customwidget>
   <customwidget>
    <class>FileSystemPathComboEdit</class>
    <extends>QWidget</extends>
-   <header>fspathedit.h</header>
+   <header>gui/fspathedit.h</header>
    <container>1</container>
   </customwidget>
  </customwidgets>

src/gui/optionsdialog.ui

@@ -3388,7 +3388,7 @@ Use ';' to split multiple entries. Can use wildcard '*'.</string>
   <customwidget>
    <class>FileSystemPathLineEdit</class>
    <extends>QWidget</extends>
-   <header>fspathedit.h</header>
+   <header>gui/fspathedit.h</header>
    <container>1</container>
   </customwidget>
  </customwidgets>

src/gui/properties/propertieswidget.cpp

@@ -68,7 +68,7 @@
 #include "ui_propertieswidget.h"
 
 #ifdef Q_OS_MACOS
-#include "macutilities.h"
+#include "gui/macutilities.h"
 #endif
 
 PropertiesWidget::PropertiesWidget(QWidget *parent)

src/gui/torrentcategorydialog.ui

@@ -87,7 +87,7 @@
   <customwidget>
    <class>FileSystemPathComboEdit</class>
    <extends>QWidget</extends>
-   <header>fspathedit.h</header>
+   <header>gui/fspathedit.h</header>
    <container>1</container>
   </customwidget>
  </customwidgets>