Change output shorthand back to -o (#451)

Co-authored-by: Bhargav Nookala <nooknb@gmail.com>

Author: samiyaakhtar

src/commands/deployment/get.decorator.json

@@ -39,7 +39,7 @@
       "defaultValue": ""
     },
     {
-      "arg": "-O, --output <output-format>",
+      "arg": "-o, --output <output-format>",
       "description": "Output the information one of the following: normal, wide, JSON",
       "defaultValue": "normal"
     },

tests/validations.sh

@@ -432,7 +432,7 @@ fi
 export sa_access_key=$(echo "$sa_access_key" | tr -d '"')
 spk init -f ./spk-config-test.yaml
 spk deployment get --build-id $pipeline1id
-export output=$(spk deployment get --build-id $pipeline1id -O json > file.json )
+export output=$(spk deployment get --build-id $pipeline1id -o json > file.json )
 length=$(cat file.json | jq 'length')
 if (( length > 0 )); then
   echo "$length deployment(s) were returned by spk deployment get"