fix DeepSpeed install method in env_setup.sh (#3394)

Author: ZailiWang

examples/cpu/llm/tools/env_setup.sh

@@ -183,7 +183,7 @@ if [ $((${MODE} & 0x02)) -ne 0 ]; then
     rm -rf lm-evaluation-harness
 
     # Install DeepSpeed
-    if [ $((${MODE} & 0x08)) -ge 0 ]; then
+    if [ $((${MODE} & 0x08)) -gt 0 ]; then
         if [ -d DeepSpeed ]; then
             rm -rf DeepSpeed
         fi