front: fix STDCM config section layout.

In the mockup, the consist and itinerary forms have fixed widths, while the map is responsive.

Author: kmer2016

front/src/styles/scss/applications/stdcmV2/_home.scss

@@ -13,10 +13,9 @@
     .stdcm-v2-simulation-settings {
       display: flex;
       gap: 0.813rem;
-      width: 55%;
 
       .stdcm-v2-consist-container {
-        width: 45%;
+        width: 20.125rem;
 
         .stdcm-v2-consist-img {
           overflow: hidden;
@@ -40,7 +39,7 @@
         flex-direction: column;
         gap: 32px;
         min-width: 28.125rem;
-        width: 55%;
+        width: 28.125rem;
         position: relative;
         align-items: center;
 
@@ -196,8 +195,8 @@
         0px 0px 0px 2px rgba(255, 255, 255, 0.75) inset,
         0px 0px 0px 1px rgba(0, 0, 0, 0.25) inset;
       margin-left: 2rem;
-      width: 55%;
-      height: 48.7rem;
+      width: 100%;
+      height: 48.5rem;
     }
   }
 }