gcompris, sed correct minSdkVersion to work

I've disabled the previous versions which do not work at all. I've added the line to sed the defaultConfig in gradle to ensure the minSdkVersion is correct and not reset to 0.

Required

• The app complies with the inclusion criteria
• All related fdroiddata and RFP issues have been referenced in this merge request
• Builds with fdroid build

Strongly Recommended

• The upstream app source code repo contains the app metadata (summary/description/images/changelog/etc) in a Fastlane or Triple-T folder structure
• Releases are tagged

Suggested

• External repos are added as git submodules instead of srclibs
• Multiple apks for native code

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Closes fdroiddata#