styling: #3985 graph header button spacing

backend/src/appenlight/static/css/front.css

@@ -8447,6 +8447,12 b' h4 {'
 .top-state-front_dashboard .chart-layout-form {
   margin-bottom: 15px;
 }
+form.graph-type.form-inline {
+  margin: 0 10px 10px 0;
+}
+form.graph-type.form-inline select {
+  margin-right: 10px;
+}
 table.log-list .http_status {
   width: 52px;
 }

frontend/css/sections/front_dashboard.css.less

@@ -292,9 +292,10 b''
     }
 }
 
-.graph-type {
-    .select.input-sm,
-    .btn-group {
+form.graph-type.form-inline {
         margin: 0 10px 10px 0;
-    }
+
+        select {
+            margin-right: 10px;
+        }
 }