Remove the question mark from the Volume th

This makes it consistent with other volume columns across the app.

ui/app/templates/components/job-page/parts/task-groups.hbs

@@ -11,7 +11,7 @@
         {{#t.sort-by prop="name"}}Name{{/t.sort-by}}
         {{#t.sort-by prop="count"}}Count{{/t.sort-by}}
         {{#t.sort-by prop="queuedOrStartingAllocs" class="is-3"}}Allocation Status{{/t.sort-by}}
-        {{#t.sort-by prop="volumes.length"}}Volume?{{/t.sort-by}}
+        {{#t.sort-by prop="volumes.length"}}Volume{{/t.sort-by}}
         {{#t.sort-by prop="reservedCPU"}}Reserved CPU{{/t.sort-by}}
         {{#t.sort-by prop="reservedMemory"}}Reserved Memory{{/t.sort-by}}
         {{#t.sort-by prop="reservedEphemeralDisk"}}Reserved Disk{{/t.sort-by}}