### Tested versions

See "System information" below.

### System information

Godot v4.1.4.rc (2d3b2abcf) - Windows 10.0.19045 - Vulkan (Compatibility) - NVIDIA GeForce GTX 970 (NVIDIA; 31.0.15.2698) - Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 Threads)

### Issue description

POT generation ignores tr() expression in dictionaries:
```python
var strDeclarer = { 'N':tr("North"), 'E':tr("East"), 'S':tr("South"), 'W':tr("West") }[declarer]
var strVulnerable = { 0:tr("none"), 1:tr("both"), 2:tr("NS"), 3:tr("EW") }[vulnerable]
```
Strings as tr() parameters do not show up in the POT file.

### Steps to reproduce

FYI: [Creating the PO template - Automatic generation using the editor](https://docs.godotengine.org/en/stable/tutorials/i18n/localization_using_gettext.html#automatic-generation-using-the-editor)

### Minimal reproduction project (MRP)

N/A
StringName assignee_name;
	if (p_assignment->assignee->type == GDScriptParser::Node::IDENTIFIER) {
		assignee_name = static_cast<const GDScriptParser::IdentifierNode *>(p_assignment->assignee)->name;
	} else if (p_assignment->assignee->type == GDScriptParser::Node::SUBSCRIPT) {
		const GDScriptParser::SubscriptNode *subscript = static_cast<const GDScriptParser::SubscriptNode *>(p_assignment->assignee);
		if (subscript->is_attribute && subscript->attribute) {
			assignee_name = subscript->attribute->name;
		} else if (subscript->index && _is_constant_string(subscript->index)) {
			assignee_name = subscript->index->reduced_value;
		}
	}
	if (assignee_name != StringName() && assignment_patterns.has(assignee_name) && _is_constant_string(p_assignment->assigned_value)) {
		
		ids->push_back(p_assignment->assigned_value->reduced_value);
	} else if (assignee_name == fd_filters && p_assignment->assigned_value->type == GDScriptParser::Node::CALL) {
		
		
		const GDScriptParser::CallNode *call_node = static_cast<const GDScriptParser::CallNode *>(p_assignment->assigned_value);
		if (!call_node->arguments.is_empty() && call_node->arguments[0]->type == GDScriptParser::Node::ARRAY) {
			const GDScriptParser::ArrayNode *array_node = static_cast<const GDScriptParser::ArrayNode *>(call_node->arguments[0]);
			
			for (int i = 0; i < array_node->elements.size(); i++) {
				_extract_fd_constant_strings(array_node->elements[i]);