Fix delete chip error (#31)

Fix regression from #28 when deleting a chip.  Also remove structure box when chip deleted.

Signed-off-by: Justin Georgi <justin.georgi@gmail.com>

Reviewed-on: Georgi_Lab/ALVINN_f7#31

src/pages/detect.vue

@@ -325,7 +325,9 @@
       deleteChip ( iChip ) {
         f7.dialog.confirm(`${this.resultData.detections[iChip].label} is identified with ${this.resultData.detections[iChip].confidence.toFixed(1)}% confidence. Are you sure you want to delete it?`, () => {
           this.resultData.detections.splice(iChip, 1)
-          this.selectChip = -1
+          this.selectedChip = -1
+          const box = this.$refs.structure_box
+          box.style.display = 'none'
         });
       },
       getImage () {