Fix fallback to pif.json if included

- pif.json is only to be used in building the module if at some point in the future it's safe to include pif.json in the module zip again
- custom.pif.json is still the correct name to use for retaining the custom file through a module update

app/src/main/cpp/main.cpp

@@ -251,7 +251,7 @@ static void companion(int fd) {
 
     FILE *json = fopen(CUSTOM_JSON_FILE_PATH, "r");
     if (!json)
-       FILE *json = fopen(JSON_FILE_PATH, "r");
+        json = fopen(JSON_FILE_PATH, "r");
 
     if (json) {
         fseek(json, 0, SEEK_END);