[4.0] RTL: Fixing template tree

[infograf768]

Summary of Changes

Overriding _treeselect.scss by adding RTL specific css

Testing Instructions

Display Cassiopea template edit using Persian language or setting en-GB.xml to rtl

Before patch

After patch

[Harmageddon]

I have tested this item ✅ successfully on d0550e1

Works as advertised. Changed language to Persian, applied the patch and the tree view looks way better now.
(Note that I don't speak Persian or other RTL languages, so this comment is based on my assumption how I think it makes sense)

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[infograf768]

@richard67
can you also test this one?

[richard67]

I have tested this item ✅ successfully on d0550e1

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[infograf768]

rtc
thNks for testing

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[wilsonge]

Thanks!