Utils: Make Utils::withTildeHomePath a FilePath member

Gets .osType() right in remote cases.

Change-Id: I6397996062d976d7db690c5729dd4faa1f459563
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/libs/utils/filepath.h

@@ -195,6 +195,8 @@ public:
     QString displayName(const QString &args = {}) const;
     QString nativePath() const;
     QString shortNativePath() const;
+    QString withTildeHomePath() const;
+
     bool startsWithDriveLetter() const;
 
     static QString formatFilePaths(const FilePaths &files, const QString &separator);