Revert "Fix scroll jump issue with the composer (#8788)"

This reverts commit f568a76.

Author: t3chguy

res/css/views/rooms/_SendMessageComposer.scss

@@ -31,11 +31,6 @@ limitations under the License.
         display: flex;
         flex-direction: column;
 
-        /* the below is required, without this some unexpected scroll jump
-        will occur when erasing the composer content or jumping to voice note
-        recording */
-        min-height: 45px;
-
         .mx_BasicMessageComposer_input {
             // this will center the contenteditable
             // in it's parent vertically