Remove duplicate make dist target

[phil-davis]

Issue #700

Somehow this code was added in #660 - see comment https://github.com/owncloud/activity/pull/660/files#r255856913
It duplicated the existing make dist target.

[phil-davis]

@paurakhsharma do you have any memory about this?
@DeepDiver1975 I see that you were involved in some review of #660 and that various other code blocks were added to Makefile - do you have any memory about it?

[codecov]

Codecov Report

Merging #708 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #708   +/-   ##
========================================
  Coverage      83.9%   83.9%           
  Complexity      502     502           
========================================
  Files            45      45           
  Lines          1802    1802           
========================================
  Hits           1512    1512           
  Misses          290     290

---

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[codecov]

Codecov Report

Merging #708 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #708   +/-   ##
========================================
  Coverage      83.9%   83.9%           
  Complexity      502     502           
========================================
  Files            45      45           
  Lines          1802    1802           
========================================
  Hits           1512    1512           
  Misses          290     290

---

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 13d6ceb...d457abb. Read the comment docs.