debug: use first index from IntelSyclCompiler_VERSION_LIST

Author: ndgrigorian

libsyclinterface/cmake/modules/FindIntelSyclCompiler.cmake

@@ -99,7 +99,7 @@ if(${clangxx_result} MATCHES "0")
         message(STATUS "dpcpp ver[${IDX}]: ${X}")
         MATH(EXPR IDX "${IDX}+1")
     endforeach()
-    list(GET IntelSyclCompiler_VERSION_LIST 0 VERSION_STRING)
+    list(GET IntelSyclCompiler_VERSION_LIST 1 VERSION_STRING)
 
     # Get the dpcpp version
     string(REGEX MATCH