correct typo in fit result line

pub/lib/fit.cpp

@@ -235,7 +235,7 @@ string NCurveFit::fit_one_spec( POlc fc, ROld fd, int k, int j, const lm_control
     if( nfreedom<1 ) nfreedom = 1;
     C->fitChi2 = SQR(status.fnorm) / nfreedom;
 
-    string out = str( format( "%3i%3i2" ) % k % j );
+    string out = str( format( "%3i%3i" ) % k % j );
     for ( int i=0; i<npfree; i++ )
         out += str( format(" %12g" ) % Par[i] );
     out += str( format(" (%3i->%9.7g)" ) % status.nfev % C->fitChi2 );