MOBILE-3783 styles: Quick fix on some styles

src/core/components/combobox/combobox.scss

@@ -99,6 +99,7 @@ ion-button {
         font-weight: 400;
         font-size: 16px;
         line-height: 20px;
+        border-radius: 0;
     }
 
     .select-text {

src/theme/components/format-text.scss

@@ -193,6 +193,13 @@ core-format-text {
     }
 }
 
+// Erase if core-format-text display is contents again.
+.flex > core-format-text {
+    display: flex;
+}
+.core-course-title > p.item-heading > core-format-text {
+    display: inline;
+}
 
 @keyframes loading {
     0% {

src/theme/theme.base.scss

@@ -466,7 +466,7 @@ ion-toolbar {
 
         border-bottom: 3px solid var(--color-base);
 
-        ion-item::part(native) {
+        ion-item {
             --inner-border-width: 0;
         }
         ion-label {
@@ -480,9 +480,9 @@ ion-toolbar {
     .item.core-#{$color-name}-item {
         --color-base: var(--ion-color-#{$color-name});
 
-        --inner-border-width: 0 0 3px 0;
-        --border-width: 0;
-        border-bottom: 3px solid var(--color-base) !important;
+        --border-width: 0 0 3px 0;
+        --border-color: var(--color-base);
+        --inner-border-width: 0;
         ion-icon {
             color: var(--color-base);
         }