fix(template-base): install correct version of plugin-fuses

[erickzhao]

Context

In #3480, we added the @electron/fuses plugin to our templates.

This was done by adding the dependencies directly into the tmpl/package.json file for each template like so:

forge/packages/template/base/tmpl/package.json

Lines 13 to 16 in 71eb328

	"devDependencies": {
	"@electron/fuses": "^1.7.0",
	"@electron-forge/plugin-fuses": "^7.2.0"
	},

This approach eventually caused two problems:

1. The import command didn't install the correct Fuses dependency (ref Error: Cannot find module '@electron-forge/plugin-fuses' when npm run make after importing manually created project #3509)
2. The init script was hard-coding the version to ^7.2.0 instead of matching the current Electron Forge version.

The first bug was fixed by #3535, which added both @electron/fuses and @electron-forge/plugin-fuses to the base dependencies we install via the initNPM utility function:

forge/packages/api/core/src/api/init-scripts/init-npm.ts

Lines 18 to 27 in 34c33fa

	export const devDeps = [
	'@electron/fuses',
	siblingDep('cli'),
	siblingDep('maker-squirrel'),
	siblingDep('maker-zip'),
	siblingDep('maker-deb'),
	siblingDep('maker-rpm'),
	siblingDep('plugin-auto-unpack-natives'),
	siblingDep('plugin-fuses'),
	];

Solution

#3535 actually made adding the deps via tmpl/package.json redundant because they're treated as "common" dependencies (i.e. non-template-specific) and installed anyways. The solution to fixing the second problem is just to remove the deps from tmpl/package.json altogether.

BaseTemplate changes

While crafting this PR, I found that we actually support adding dependencies via templates in another way: adding them to the TemplateClass.dependencies or TemplateClass.devDependencies arrays.

The BaseTemplate has a getter for devDependencies that does the magic replacement for the ELECTRON_FORGE/VERSION syntax, but no equivalent for dependencies. This PR changes that.

It also extends a specific custom initializer fixture to grab dependencies and devDependencies from the base package.json via these getters so that custom deps are added to what we expect from the base template.