[PhotonClient] Fix misc bugs and dataflow errors (#861)

Fixes leftover bugs from #767 and #856

- Because new URLs aren't based on hash URL schemas, all the routes need to be updated to final paths instead of relative ones that were previously caught by the hash URL
- Fixed misc Vue warnings pointed out by @mcm001

photon-client/src/App.vue

@@ -32,7 +32,7 @@
 
         <v-list-item
           link
-          to="dashboard"
+          to="/dashboard"
           @click="rollbackPipelineIndex()"
         >
           <v-list-item-icon>
@@ -45,7 +45,7 @@
         <v-list-item
           ref="camerasTabOpener"
           link
-          to="cameras"
+          to="/cameras"
           @click="switchToDriverMode()"
         >
           <v-list-item-icon>
@@ -57,7 +57,7 @@
         </v-list-item>
         <v-list-item
           link
-          to="settings"
+          to="/settings"
           @click="switchToSettingsTab()"
         >
           <v-list-item-icon>
@@ -69,7 +69,7 @@
         </v-list-item>
         <v-list-item
           link
-          to="docs"
+          to="/docs"
         >
           <v-list-item-icon>
             <v-icon>mdi-bookshelf</v-icon>
@@ -197,7 +197,7 @@
         <v-card-text>
           PhotonVision cannot connect to the NetworkTables Server. Please visit the
           <router-link
-            to="settings"
+            to="/settings"
             class="accent--text"
             @click="switchToSettingsTab"
           >