[Bug]: Report export returns an error when using teal as a shiny module

### What happened?

When I embed modules from `teal.modules.general` in a shiny app using teal framework as shiny module download report throws an error.


Here is a minimal example:

```
library(shiny)
library(random.cdisc.data)
library(teal.modules.general)

modules <- modules(
tm_g_bivariate(
x = data_extract_spec(
dataname = "ADSL",
select = select_spec(
label = "Select variable:",
choices = variable_choices("ADSL"),
selected = "AGE",
fixed = FALSE
)
),
y = data_extract_spec(
dataname = "ADSL",
select = select_spec(
label = "Select variable:",
choices = variable_choices("ADSL"),
selected = "SEX",
multiple = FALSE,
fixed = FALSE
)
)
)
)

ui <- fluidPage(
titlePanel("{teal} as shiny module: teal.modules.general"),
ui_teal(id = "teal", modules = modules)
)

server <- function(input, output) {
data <- reactive({
teal_data(
ADSL = random.cdisc.data::radsl(seed = 1)
)
})

srv_teal(id = "teal", data = data, modules = modules)
}

shinyApp(ui = ui, server = server)

```

### How to reproduce

1. Initial app
2. Add View to report
3. Navigate to report previewer
4. Click download report (see screenshot above)

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