Fix double bdk assignation

[Czino]

Fix for removing duplication in the compiled NativeLoader.js

export class NativeLoader {
    constructor() {
        this._bdk = NativeModules.BdkRnModule;
        this._bdk = NativeModules.BdkRnModule;
    }
}

to

export class NativeLoader {
    constructor() {
        this._bdk = NativeModules.BdkRnModule;
    }
}