monaco_editor: remove buggy autoIndent: true

true is not an allowed value, causing a visible problem tabSize to be
ignored on empty documents and using 4 for python.
8 jobs for feat/monaco-0.51.0 in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner2

02:32:02

failed ERP5.UnitTest-TestRunner2

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passed ERP5.CodingStyleTest-TestRunner2

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passed ERP5.CodingStyleTest-TestRunner2

02:30:56

passed ERP5.CodingStyleTest-TestRunner2

01:59:25

passed ERP5.UnitTest-TestRunner2

01:47:10

passed ERP5.UnitTest-TestRunner2

04:27:10

passed ERP5.UnitTest-TestRunner2

04:13:24