fix: merchant view fix in 0.80 and above and plugin compiling on 0.78…

[Yaswanth0606]

Issues before this pr:

• Merchant View didn't work on react native versions above 0.80 in iOS. In dynamic linking the view failed to render and in static linking a build error. Android worked fine.
• The user's iOS build got failed when used with react native version 0.78, 0.79.

The errors:

Changes done:

• Fixed Merchant view till latest versions 0.81.
• Made iOS merchant view separate according to user's react native version.