Add placeholder for kinit's store file name.

diff --git a/src/kdeinitinterface.cpp b/src/kdeinitinterface.cpp
index 22fa5e5..3d40937 100644
--- a/src/kdeinitinterface.cpp
+++ b/src/kdeinitinterface.cpp
@@ -52,7 +52,7 @@ void KDEInitInterface::ensureKdeinitRunning()
     // If not found in system paths, search other paths
     if (srv.isEmpty()) {
         const QStringList searchPaths = QStringList()
-            << QCoreApplication::applicationDirPath() // then look where our application binary is located
+            << QString::fromUtf8("@SUBSTITUTEME@/bin") // using QStringLiteral would be more efficient, but breaks guix store reference detection.
             << QLibraryInfo::location(QLibraryInfo::BinariesPath); // look where exec path is (can be set in qt.conf)
         srv = QStandardPaths::findExecutable(QStringLiteral("kdeinit5"), searchPaths);
         if (srv.isEmpty()) {
r>
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<tr><td><span title='2019-07-14 18:13:34 +0200'>2019-07-14</span></td><td><a href='/guix/commit/gnu/packages/synergy.scm?id=97149c576762de7fd8e1a6ac8f46c97d3490b360'>gnu: Adjust uses of C{,PLUS}_INCLUDE_PATH for GCC 7.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-01-25 13:21:19 +0100'>2019-01-25</span></td><td><a href='/guix/commit/gnu/packages/synergy.scm?id=843ce5b41939f213e588921d5a8e11e4051b4e40'>gnu: synergy: Update to 1.10.1.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>