fix bug in import of "time map" LANSCE data

Author: vondreele

GSASII/imports/G2pwd_fxye.py

@@ -270,7 +270,7 @@ def Tmap2TOF(TMap,clockWd):
                 TOF += [T+Step*(i-Tch) for i in range(Tch,tch)]
                 Tch,T,Step = tmap
             TOF = np.array(TOF)*clockWd
-            return TOF
+            return TOF[:-1]     #code makes extra step
 
         Banks = []
         Pos = []