remove unnecessary dispatch group
remove unnecessary dispatch group

hug963/CordovaCameraPreview,cordova-plugin-camera-preview/cordova-plugin-camera-preview,bvx89/cordova-plugin-camera-preview,hug963/CordovaCameraPreview,Et3rnal/cordova-plugin-camera-preview,Et3rnal/cordova-plugin-camera-preview,divampo/cordova-plugin-camera-preview,mbppower/CordovaCameraPreview,piobuilleann/cordova-plugin-camera-preview,SVANNER/cordova-plugin-camera-preview,anneb/cordova-plugin-camera-preview,divampo/cordova-plugin-camera-preview,SVANNER/cordova-plugin-camera-preview,mbppower/CordovaCameraPreview,cordova-plugin-camera-preview/cordova-plugin-camera-preview,bvx89/cordova-plugin-camera-preview,anneb/cordova-plugin-camera-preview,piobuilleann/cordova-plugin-camera-preview