Fix part of #632: StorySummaryAdapter to use BindableAdapter

[anandwana001]

Explanation

Fixes a part of #632

Checklist

• The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• The PR explanation includes the words "Fixes #bugnum: ..." (or "Fixes part of #bugnum" if the PR only partially fixes an issue).
• The PR follows the style guide.
• The PR does not contain any unnecessary auto-generated code from Android Studio.
• The PR is made from a branch that's not called "develop".
• The PR is made from a branch that is up-to-date with "develop".
• The PR's branch is based on "develop" and not on any other branch.
• The PR is assigned to an appropriate reviewer in both the Assignees and the Reviewers sections.

[anandwana001]

@yashraj-01 Adding you as a review for this PR, as your GSoC project is going to have a lot around the app module, so I was thinking it might be helpful if you review this PR. It's voluntary thing.

[FareesHussain]

@anandwana001 Left a comment, PTAL

[oppiabot]

Unassigning @FareesHussain since the review is done.

[fsharpasharp]

Approving for the BUILD.bazel change.

[rt4914]

LGTM, Suggestion nit changes.

[rt4914]

LGTM, thanks.