widgets: Add CSS to set width of inputs.

This commit adds CSS to set width of text inputs in
poll and todo widgets to 206px as we will be removing
the bootstrap CSS rule which sets width of inputs to
206px in further commits.

web/styles/widgets.css

@@ -90,6 +90,15 @@
         margin: 0 0 5px;
         padding: 0;
     }
+
+    & input {
+        &.poll-question,
+        &.poll-option,
+        &.add-task,
+        &.add-desc {
+            width: 206px;
+        }
+    }
 }
 
 .poll-widget {