Fix: [AEA-0000] - use env var name rather than value (#2862)

## Summary

- Routine Change

### Details

- use env var name rather than value

Author: anthony-nhs

SAMtemplates/functions/main.yaml

@@ -97,16 +97,16 @@ Parameters:
     Type: String
 
   TestPrescriptionsParamName1:
-    Type: AWS::SSM::Parameter::Value<String>
+    Type: String
 
   TestPrescriptionsParamName2:
-    Type: AWS::SSM::Parameter::Value<String>
+    Type: String
 
   TestPrescriptionsParamName3:
-    Type: AWS::SSM::Parameter::Value<String>
+    Type: String
 
   TestPrescriptionsParamName4:
-    Type: AWS::SSM::Parameter::Value<String>
+    Type: String
 
 Conditions:
   ShouldDeployCheckPrescriptionStatusUpdate: !Equals