fix (maker-dmg): added missing title option

[mahnunchik]

• [x] I have read the contribution documentation for this project.
• [x] I agree to follow the code of conduct that this project follows, as appropriate.
• [ ] The changes are appropriately documented (if applicable).
• [ ] The changes have sufficient test coverage (if applicable).
• [ ] The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

Added missing title option: https://github.com/electron-userland/electron-installer-dmg#api

[malept]

I think it's more appropriate to add a TypeScript definition to electron-installer-dmg and effectively replace Config.ts with that, than add missing config to a Forge-specific definition. See #1644 for a similar action that happened with electron-installer-snap.

[mahnunchik]

I definitely agree with it.

[codecov[bot]]

Codecov Report

Merging #1755 (80b3bcd) into master (4824af6) will increase coverage by 12.42%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1755       +/-   ##
===========================================
+ Coverage   60.28%   72.71%   +12.42%     
===========================================
  Files          71       74        +3     
  Lines        2153     2221       +68     
  Branches      411      420        +9     
===========================================
+ Hits         1298     1615      +317     
+ Misses        676      446      -230     
+ Partials      179      160       -19     

Impacted Files	Coverage Δ
packages/utils/async-ora/src/index.ts	100.00% <0.00%> (ø)
packages/maker/wix/src/MakerWix.ts	86.36% <0.00%> (ø)
packages/maker/zip/src/MakerZIP.ts	100.00% <0.00%> (ø)
packages/maker/squirrel/src/MakerSquirrel.ts	77.27% <0.00%> (ø)
packages/utils/test-utils/src/index.ts	85.71% <0.00%> (+3.10%)	:arrow_up:
packages/utils/async-ora/src/ora-handler.ts	90.00% <0.00%> (+3.33%)	:arrow_up:
packages/maker/deb/src/MakerDeb.ts	100.00% <0.00%> (+5.26%)	:arrow_up:
packages/maker/rpm/src/MakerRpm.ts	100.00% <0.00%> (+5.26%)	:arrow_up:
packages/maker/dmg/src/MakerDMG.ts	100.00% <0.00%> (+5.55%)	:arrow_up:
packages/plugin/base/src/Plugin.ts	66.66% <0.00%> (+6.66%)	:arrow_up:
... and 20 more

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[mahnunchik]

@malept meanwhile i think it simpler to apply this PR. I have to override default title in my app. I updated PR on latest master.

[erickzhao]

Closing this in favour of https://github.com/electron-userland/electron-installer-dmg/pull/178