Move commit css to commits section. Remove box-shadow for text fields to match global style

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/generic/forms.scss

@@ -76,30 +76,10 @@ label {
   }
 }
 
-.commit-message-container {
-  background-color: $body-bg;
-  position: relative;
-  font-family: $monospace_font;
-  $left: 12px;
-  .max-width-marker {
-    width: 72ch;
-    color: rgba(0, 0, 0, 0.0);
-    font-family: inherit;
-    left: $left;
-    height: 100%;
-    border-right: 1px solid mix($input-border, white);
-    position: absolute;
-    z-index: 1;
-  }
-  > textarea {
-    background-color: rgba(0, 0, 0, 0.0);
-    font-family: inherit;
-    padding-left: $left;
-    position: relative;
-    z-index: 2;
-  }
-}
-
 .fieldset-form fieldset {
   margin-bottom: 20px;
 }
+
+.form-control {
+  @include box-shadow(none);
+}

app/assets/stylesheets/sections/commits.scss

@@ -213,3 +213,27 @@ li.commit {
     padding: 4px 12px;
   }
 }
+
+.commit-message-container {
+  background-color: $body-bg;
+  position: relative;
+  font-family: $monospace_font;
+  $left: 12px;
+  .max-width-marker {
+    width: 72ch;
+    color: rgba(0, 0, 0, 0.0);
+    font-family: inherit;
+    left: $left;
+    height: 100%;
+    border-right: 1px solid mix($input-border, white);
+    position: absolute;
+    z-index: 1;
+  }
+  > textarea {
+    background-color: rgba(0, 0, 0, 0.0);
+    font-family: inherit;
+    padding-left: $left;
+    position: relative;
+    z-index: 2;
+  }
+}