refactor(syncengine): use if init-statement for excludeFilePath

Signed-off-by: Git'Fellow <12234510+solracsf@users.noreply.github.com>

Author: solracsf

src/libsync/syncengine.cpp

@@ -651,8 +651,8 @@ void SyncEngine::startSync()
     _discoveryPhase->_leadingAndTrailingSpacesFilesAllowed = _leadingAndTrailingSpacesFilesAllowed;
     _discoveryPhase->_account = _account;
     _discoveryPhase->_excludes = _excludedFiles.data();
-    const QString excludeFilePath = _localPath + QStringLiteral(".sync-exclude.lst");
-    if (FileSystem::fileExists(excludeFilePath)) {
+    if (const QString excludeFilePath = _localPath + QStringLiteral(".sync-exclude.lst");
+        FileSystem::fileExists(excludeFilePath)) {
         _discoveryPhase->_excludes->addExcludeFilePath(excludeFilePath);
         _discoveryPhase->_excludes->reloadExcludeFiles();
     }