Allow table cell text to align left

For users with certain access needs (for example tunnel vision), the
empty space between the table heading (in vertical table mode) and the
table cell content causes difficulties.

I found that the text would not become properly left-aligned at all
magnification steps until I changed both the `text-align` property of all
table cells, and the `justify-content` property.

app/assets/stylesheets/components/_table.scss

@@ -153,9 +153,8 @@ $table-row-even-background-colour: govuk-colour("light-grey", $legacy: "grey-4")
 
   .govuk-table__cell {
     display: flex;
-    justify-content: space-between;
     min-width: 1px;
-    text-align: right;
+    text-align: left;
   }
 
   @include govuk-media-query($until: $vertical-on-smallscreen-breakpoint) {