fix: MatrixGen init method for local sources

[willbrownecs]

Resolves an issue where mitreattack.navlayers.ToSVG raises a value error when initialized with source="local". The issue seems to be due to comparing the expected domain values to resource values instead.

Changes tested with:

import requests
import json
import mitreattack

base_layer_dict = {
        "name": "test",
        "versions": {
            "layer": "4.5",
            "navigator": "5.3.0"
        },
        "sorting": 3, 
        "description": "test",
        "domain": "enterprise-attack",
        "techniques": [],
    }
base_layer = mitreattack.navlayers.Layer(base_layer_dict)
stix = requests.get("https://raw.githubusercontent.com/mitre/cti/master/enterprise-attack/enterprise-attack.json", verify=False).json()
with open(file="./stix.json", mode="w") as f:
    json.dump(stix, f)
blah = mitreattack.navlayers.ToSvg(domain="enterprise", source="local", resource="stix.json")
blah.to_svg(layerInit=base_layer, filepath="rule_coverage.svg")

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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