Fix displaced TabSheet caption icon in Chrome

Change-Id: Id3183b735ae911374d1a8821cd67b5abd1c094d5

WebContent/VAADIN/themes/reindeer/tabsheet/tabsheet-normal-style.scss

@@ -143,6 +143,7 @@
 }
 .v-sa & .#{$primaryStyleName}-tabs .v-captiontext {
 	display: inline-block;
+	vertical-align: middle;
 }
 .#{$primaryStyleName}-tabs .v-icon {
 	width: 16px !important;