check-whitespace: fix idempotency issue

See the comment, if there was couple whitespaces at the end of the file without newline, it would take running `check-whitespace` twice to finally fix it.

src/bonsai/bonsai/bim/data/webui/static/css/components/layeredViewPanel.css

@@ -5,8 +5,8 @@
     box-shadow: 0 0 0 3px #28a745;
     color: #ddd;
   }
-  
-  
+
+
   .classificationView {
     border-left: 5px solid #28a745;
     min-height: 200px;
@@ -15,20 +15,20 @@
     padding: 5px;
     max-height: 400px;
   }
-  
+
   .selectedClassificationText {
     color: #28a745;
   }
-  
+
   .back-button {
     margin-bottom: 20px;
   }
-  
+
   .back-button:disabled {
     cursor: not-allowed;
     background-color: #ccc;
   }
-  
+
   .classification-cell {
     display: flex;
     flex-direction: column;
@@ -36,8 +36,7 @@
     align-items: center;
     height: 100%;
   }
-  
+
   .classification {
     height: 100%;
   }
-