use style instead of theme attribute for secondary action buttons

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/res/layout/file_list_actions_bottom_sheet_fragment.xml

@@ -130,7 +130,7 @@
             android:layout_marginStart="@dimen/standard_margin"
             android:layout_marginLeft="@dimen/standard_margin"
             android:text="@string/upload_direct_camera_upload"
-            android:textColor="@color/black"
+            android:textColor="@color/textColor"
             android:textSize="@dimen/bottom_sheet_text_size" />
 
     </LinearLayout>

src/main/res/layout/files_folder_picker.xml

@@ -53,7 +53,7 @@
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/folder_picker_btn_cancel"
-            android:theme="@style/OutlinedButton"
+            style="@style/OutlinedButton"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_weight="1"

src/main/res/layout/upload_files_layout.xml

@@ -87,7 +87,7 @@
             android:layout_marginRight="@dimen/standard_half_margin"
             android:layout_weight="1"
             android:text="@string/common_cancel"
-            android:theme="@style/OutlinedButton"
+            style="@style/OutlinedButton"
             app:cornerRadius="@dimen/button_corner_radius" />
 
         <com.google.android.material.button.MaterialButton

src/main/res/layout/uploader_layout.xml

@@ -64,7 +64,7 @@
         android:padding="@dimen/standard_padding">
 
         <com.google.android.material.button.MaterialButton
-            android:theme="@style/OutlinedButton"
+            style="@style/OutlinedButton"
             android:id="@+id/uploader_cancel"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"