Fix ground disconnector and ground in FlatDesignLibrary

[flo-dup]

Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem? No

What kind of change does this PR introduce? Bug fix

What is the current behavior? Grounds/ground disconnectors have display bugs when using FlatDesignLibrary (stroke width thicker than other equipments/wires, ground displayed above the wire, wire continuing behind ground disconnector)

What is the new behavior (if this is a feature change)? Display bugs fixed

Does this PR introduce a breaking change or deprecate an API?

• [ ] Yes
• [x] No

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud