Typo in sample/Makefile

[sekocabas]

When compiling the debug version of the sample programs, there is an issue with ctmrg-g build. The following change on line 67 seems to fix it.

--- a/sample/Makefile
+++ b/sample/Makefile
@@ -64,7 +64,7 @@ trg-g: mkdebugdir .debug_objs/trg.o $(ITENSOR_GLIBS) $(TENSOR_HEADERS)
 ctmrg: ctmrg.o $(ITENSOR_LIBS) $(TENSOR_HEADERS)
        $(CCCOM) $(CCFLAGS) ctmrg.o -o ctmrg $(LIBFLAGS)
 
-ctmrg-g: mkdebugdir .debug_objs/trg.o $(ITENSOR_GLIBS) $(TENSOR_HEADERS)
+ctmrg-g: mkdebugdir .debug_objs/ctmrg.o $(ITENSOR_GLIBS) $(TENSOR_HEADERS)
        $(CCCOM) $(CCGFLAGS) .debug_objs/ctmrg.o -o ctmrg-g $(LIBGFLAGS)