Fix dark tray icon option making all icons dark

Introduces a separate path for tray icons which are neither locked nor
unlocked.

Closes #1556.

src/core/FilePath.cpp

@@ -97,6 +97,15 @@ QString FilePath::wordlistPath(const QString& name)
 }
 
 QIcon FilePath::applicationIcon()
+{
+#ifdef KEEPASSXC_DIST_SNAP
+    return icon("apps", "keepassxc", false);
+#else
+    return icon("apps", "keepassxc");
+#endif
+}
+
+QIcon FilePath::trayIcon()
 {
     bool darkIcon = useDarkIcon();
 
@@ -107,7 +116,6 @@ QIcon FilePath::applicationIcon()
 #endif
 }
 
-
 QIcon FilePath::trayIconLocked()
 {
 #ifdef KEEPASSXC_DIST_SNAP