Fix ordering in app.ini and fix run mode option

[Morlinest]

Move APP_MODE to root section in app.ini (where it should be:

gitea/modules/setting/setting.go

Line 652 in 5866eb2

AppName = Cfg.Section("").Key("APP_NAME").MustString("Gitea: Git with a cup of tea")

) and remove unused APP_MODE option.

[codecov-io]

Codecov Report

Merging #2829 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2829   +/-   ##
=======================================
  Coverage   26.84%   26.84%           
=======================================
  Files          89       89           
  Lines       17608    17608           
=======================================
  Hits         4727     4727           
  Misses      12195    12195           
  Partials      686      686

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[sapk]

LGTM

[lunny]

@Morlinest it's RUN_MODE not APP_MODE

; Either "dev", "prod" or "test", default is "dev"
RUN_MODE = dev

[lunny]

LGTM

[lafriks]

Make LG-TM work

[Morlinest]

@lunny Thx, so it was mistake in naming (I didn't check that). I changed PR to fix name instead of removing it. Also moved it in right place in app.ini file.

@sapk @lafriks FYI, changed PR a little bit.