fix: generate correct override stub for interface when implementation from base class#2969

HerrCai0907 wants to merge 2 commits intoAssemblyScript:mainAssemblyScript/assemblyscript:mainfrom

HerrCai0907:2968-bug-compiler-generated-override-gettersetter-for-filed-in-interface-incorrectlyHerrCai0907/assemblyscript:2968-bug-compiler-generated-override-gettersetter-for-filed-in-interface-incorrectlyCopy head branch name to clipboard