Sqlite: Add equal operator for QString to Utf8String

Change-Id: I60993e2a140445468b6fe98604cb19329dc35b1c
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/libs/sqlite/utf8string.cpp

@@ -222,6 +222,11 @@ bool operator==(const Utf8String &first, const char *second)
     return first.byteArray == second;
 }
 
+bool operator==(const Utf8String &first, const QString &second)
+{
+    return first.byteArray == second.toUtf8();
+}
+
 bool operator<(const Utf8String &first, const Utf8String &second)
 {
     if (first.byteSize() == second.byteSize())