Replace simple return if statements with ternary operators

[Snuffleupagus]

In a couple of cases, where a boolean is returned, it's also possible to use an OR operator rather a ternary.

Note: This patch reduces the size of the gulp mozcentral bundle by 960 bytes.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.14286% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.00%. Comparing base (ce4ff55) to head (ee59db5).

Files with missing lines	Patch %	Lines
src/core/xfa/xfa_object.js	71.42%	2 Missing ⚠️
src/pdf.sandbox.external.js	0.00%	2 Missing ⚠️
src/display/editor/alt_text.js	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21672      +/-   ##
==========================================
+ Coverage   89.97%   90.00%   +0.02%     
==========================================
  Files         263      263              
  Lines       66901    66859      -42     
==========================================
- Hits        60196    60175      -21     
+ Misses       6705     6684      -21     

Flag	Coverage Δ
browsertest	66.56% <69.23%> (+0.02%)	⬆️
fonttest	9.04% <14.28%> (+<0.01%)	⬆️
integrationtest	69.34% <67.85%> (+0.01%)	⬆️
unittest	57.84% <53.57%> (+<0.01%)	⬆️
unittestcli	56.58% <57.69%> (+0.01%)	⬆️

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[Snuffleupagus]

/botio browsertest

[moz-tools-bot]

From: Bot.io (Windows)

---

Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/a59b5775852b0f9/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/5eebb7b77c52b09/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Success

Full output at http://54.241.84.105:8877/5eebb7b77c52b09/output.txt

Total script time: 18.02 mins

• Regression tests: Passed

[moz-tools-bot]

From: Bot.io (Windows)

---

Success

Full output at http://54.193.163.58:8877/a59b5775852b0f9/output.txt

Total script time: 23.27 mins

• Regression tests: Passed

[timvandermeij]

Looks good; thank you for doing this!