Make colorpicker trigger focusable

Signed-off-by: Raimund Schlüßler <raimund.schluessler@mailbox.org>

src/components/NcActionInput/NcActionInput.vue

@@ -199,10 +199,11 @@ For the multiselect component, all events will be passed through. Please see the
 							<NcColorPicker v-else-if="type=='color'"
 								:id="inputId"
 								:value="value"
-								:class="{ focusable: isFocusable }"
 								class="colorpicker__trigger"
 								@input="onInput">
-								<div :style="{'background-color': value}" class="colorpicker__preview" />
+								<button :style="{'background-color': value}"
+									class="colorpicker__preview"
+									:class="{ focusable: isFocusable }" />
 							</NcColorPicker>
 
 							<NcTextField v-else
@@ -548,6 +549,8 @@ $input-margin: 4px;
 				width: 100%;
 				height: 36px;
 				border-radius: var(--border-radius-large);
+				border: 2px solid var(--color-border-maxcontrast);
+				box-shadow: none !important;
 			}
 		}
 	}