Fixing build with gcc 4.5

http://bugs.gentoo.org/show_bug.cgi?id=320879

--- a/src/scim_sinhala_imengine.cpp
+++ b/src/scim_sinhala_imengine.cpp
@@ -233,7 +233,7 @@
 
 void SinhalaInstance::backspace()
 {
-	KeyEvent e = scim::KeyEvent::KeyEvent(SCIM_KEY_BackSpace, 0);
+	KeyEvent e = scim::KeyEvent(SCIM_KEY_BackSpace, 0);
 	forward_key_event(e);
 }