remove addition of underscores to variables

[PaulaScharf]

When getting a variable an extra underscore is added to underscores, but not when setting it. Declaring and using a variable which is for example called "player_1" doesnt work at the moment.

The underscores used to be added to deal with special characters, but that is handled differently now.

[github-actions]

Tests

Test Name	Status	Flaky	Duration
Blockly Editor Page Tests [Blockly] visits the editor page	✅		979ms
Blockly Editor Page Tests [Blockly] visits the tutorial page	✅		164ms
Blockly Editor Page Tests [Blockly] visits the gallery page	✅		123ms
Blockly Editor Page Tests [Blockly] visits the faq page	✅		122ms
Blockly Editor Page Tests [Blockly] visits the settings page	✅		119ms
Blockly Editor Page Tests [Blockly] visits the login page	✅		117ms
Blockly Editor Page Tests [Blockly] navigates to tutorial and back	✅		11.9s
Blockly Editor Page Tests [Blockly] selects senseBox ESP	✅		1.9s
Blockly Editor Page Tests [Blockly] selects senseBox MCU	✅		2.6s
Blockly Editor Page Tests [Blockly] selects senseBox Mini	✅		2.6s
Blockly Editor Page Tests [Blockly] compiles code	✅		9.8s
Code Editor Page Tests [CodeEditor] visits the code editor page	✅		1.4s
Code Editor Page Tests [CodeEditor] selects senseBox ESP	✅		477ms
Code Editor Page Tests [CodeEditor] compiles code	✅		603ms
Code Editor Page Tests [CodeEditor] opens reset dialog	✅		600ms
Code Editor Page Tests [CodeEditor] fetches libraries	✅		1.7s

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