one-way: replace ⋮ by ⟷ for one-way components

The ⋮ character is not obvious for me for refering to one-ways. This has more to deal with succession of something, like nodes or stops from the trainrun's path.

Signed-off-by: Louis Greiner <greiner.louis@gmail.com>

Author: louisgreiner

src/app/perlenkette/perlenkette.component.html

@@ -114,7 +114,7 @@
             </sbb-toggle-icon>
           </sbb-toggle-option>
           <sbb-toggle-option
-            label="&#8942;"
+            label="⟷"
             subtitle=""
             [value]="ShowTrainrunEditTab.sbb_trainrun_roundtrip_tab"
           >

src/app/view/dialogs/trainrun-and-section-dialog/trainrun-and-section-dialog.component.html

@@ -52,7 +52,7 @@
         >
           <sbb-trainrun-filter-tab (trainrunDeleted)="closeDialog()"></sbb-trainrun-filter-tab>
         </sbb-tab>
-        <sbb-tab label="&#8942;" id="trainrun-roundTrip-tab">
+        <sbb-tab label="⟷" id="trainrun-roundTrip-tab">
           <sbb-trainrun-roundtrip-tab
             (trainrunDeleted)="closeDialog()"
           ></sbb-trainrun-roundtrip-tab>