Make it more clear that the sample module is loaded

Some others reported that all their text is read, but they did not know it was
the sample module. Now this should clear


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@916 726aef4b-f618-498e-8847-2d620e286838

modules/sample.cpp

@@ -167,7 +167,7 @@ public:
 
 	virtual EModRet OnUserMsg(CString& sTarget, CString& sMessage) {
 		PutModule("[" + sTarget + "] usermsg [" + sMessage + "]");
-		sMessage = "\0034" + sMessage + "\003";
+		sMessage = "Sample: \0034" + sMessage + "\003";
 
 		return CONTINUE;
 	}