Unbreak `PackageManagerProxy.installedPackages()`

[cyberMilosz]

At some point, installedPackages() got modified from

https://github.com/WithSecureLabs/drozer/blob/8a7a2853fb01d3500794e982a5b4963e9428e995/src/drozer/modules/common/package_manager.py#L106-L111

to

https://github.com/WithSecureLabs/drozer/blob/a9018a2f15000bec1d598174a4076125652fe21e/src/drozer/modules/common/package_manager.py#L105-L110

This means that every time we call getPackages() with flags other than GET_META_DATA, those flags get ignored. This is very bad, because a fair few modules request these flags. This immediately breaks at least 2 modules:

• app.provider.info (when run without specifying a single package - either on all packages or with a filter)
• auxiliary.webcontentresolver (when trying to generate a list of providers)

It is highly likely that it also broke other modules, and that workarounds may have been implemented to work around it.

What needs to happen:

• Undo that change so we start using flags again
• All modules using getPackages() need to get tested for regression
  • Chances are that the ones which specified flags will still be fine (or happier than they were before), but we should review them
  • There are only 3 places that don't specify flags
  • Probably worth diffing these against drozer 2 to pick up any unnecessary workarounds