Fix counter script: get count instead of non-existent greeting (#1802)

Author: turbolent

internal/super/generator/templates/script_counter.cdc.tmpl

@@ -1,6 +1,6 @@
 import "{{ .ContractName }}"
 
 access(all)
-fun main(): String {
-  return {{ .ContractName }}.greeting
-}
+fun main(): Int {
+  return {{ .ContractName }}.getCount()
+}