remove extra Tinymce code

[brianteeman]

Pull Request for Issue # 9339.

Summary of Changes

Remove duplicated code icon

Testing Instructions

Check in the advanced AND extended modes of tinmyce and you will see two code icons. One after the image icon and one at the very end

This PR removes the second instance

[AlexRed]

I have tested this item ✅ successfully on 15a4c81

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[stellainformatica]

I have tested this item 🔴 unsuccessfully on 15a4c81

The PR solves the issue for extended funcionality, but in this way in Advanced funcionality there is no more <> button.
If you change just the line 890, then you'll have the expected result.
I would suggest not to put the code button at the end, but in the middle, in this way

toolbar1: "$toolbar1 | code | $toolbar5 ",

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[1apweb]

I have tested this item ✅ successfully on 15a4c81

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[joomla-cms-bot]

This PR has received new commits.

CC: @1apweb, @AlexRed, @stellainformatica

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[stellainformatica]

I have tested this item ✅ successfully on 655d7fa

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[richard67]

I have tested this item ✅ successfully on 655d7fa

Tested in both advanced and extended mode that in both cases there is 1 icon "<>" for source code insert shown after the icon for image insert.

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[brianteeman]

RTC

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[wilsonge]

Thanks Brian!