misc: add search tooltip

Change-Id: I55e29557eca3b32c714a313cd18aff66a870fd0f
GitLab: #1343

src/app/mainview/components/Searchbar.qml

@@ -75,6 +75,7 @@ Rectangle {
         radius: hoverButtonRadius
         hoveredColor: JamiTheme.hoveredButtonColor
         source: JamiResources.ic_baseline_search_24dp_svg
+        toolTipText: JamiStrings.search
         normalColor: "transparent"
         imageColor: {
             if (reductionEnabled) {