js: Add findHomography js bindings.

Removed constants from legacy C api and switched out header with shorter version.

Removed blank line that was failing CI.

modules/js/test/tests.js

@@ -45,7 +45,9 @@ testrunner.run(
     {
         code: 'opencv.js',
         tests: ['test_mat.js', 'test_utils.js', 'test_imgproc.js',
-                'test_objdetect.js', 'test_video.js', 'test_features2d.js'],
+                'test_objdetect.js', 'test_video.js', 'test_features2d.js',
+                'test_calib3d.js'
+        ],
     },
     function(err, report) {
         console.log(report.failed + ' failed, ' + report.passed + ' passed');