changed 'mark as resolved' icon to only a checkmark based on user feedback.

Change-Id: I839206d30f0f2db158e23d683ff8cdc0e63398c9
Signed-off-by: Michael Davis <michael.s.davis@ibm.com>
diff --git a/app/assets/images/icon-check-white.svg b/app/assets/images/icon-check-white.svg
new file mode 100644
index 0000000..7f11b2c
--- /dev/null
+++ b/app/assets/images/icon-check-white.svg
@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 14 12"><defs><style>.cls-1{fill:#fff;}</style></defs><title>Artboard 1</title><polygon class="cls-1" points="14 2.2 12.2 0.5 4.7 8 1.8 5.1 0 6.9 4.7 11.5 14 2.2"/></svg>
\ No newline at end of file