Makefile: fix metainfo file privileges in the install target
The metainfo file permission is currently 0755 while it should be 0644.
The metainfo Appstream file does not need any execution privilege since this is not a script nor an executable.
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The metainfo file permission is currently 0755 while it should be 0644.
The metainfo Appstream file does not need any execution privilege since this is not a script nor an executable.