Update AdminLTE to 2.4.15

[amosfolz]

Will need help identifying if anything in AdminLTE-custom.js that I removed is actually still needed. (As far as I can tell, it is not)

issue #994

[amosfolz]

I just looked this over and manually tested again. Pending if @lcharette can remember what these lines were meant to fix, this is ready for merge.

[lcharette]

Pending if @lcharette can remember what these lines were meant to fix, this is ready for merge.

https://github.com/userfrosting/UserFrosting/blob/master/app/sprinkles/core/assets/userfrosting/js/AdminLTE-custom.js#L59

Overwrite here. Otherwise, the menu href based active will be removed

Not sure what that meant, but I believe it's linked to nested entries in the nav menu. Might be something that's been solved in newer version of AdminLTE.

[amosfolz]

Okay, I'll test out a nested menu to make sure it's working right.

[amosfolz]

Just putting this here for reference https://adminlte.io/docs/2.4/upgrade-guide

[codecov]

Codecov Report

Merging #1015 into develop will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1015   +/-   ##
==========================================
  Coverage      66.93%   66.93%           
  Complexity      1913     1913           
==========================================
  Files            159      159           
  Lines           6684     6684           
==========================================
  Hits            4474     4474           
  Misses          2210     2210

---

Continue to review full report at Codecov.

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[codecov]

Codecov Report

Merging #1015 into develop will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1015   +/-   ##
==========================================
  Coverage      66.96%   66.96%           
  Complexity      1918     1918           
==========================================
  Files            160      160           
  Lines           6693     6693           
==========================================
  Hits            4482     4482           
  Misses          2211     2211

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 66df775...6105a86. Read the comment docs.

[amosfolz]

I tested the tree-view and everything worked OK.

[lcharette]

They are making fun of you !

https://github.com/ColorlibHQ/AdminLTE/releases/tag/v2.4.15

[lcharette]

Alright, let's freeze it on 2.4.15 for now