Feedback Dialog: Fixes text wrapping issue for French.

It is said to be a M57 regression, but no one has touchedthe feedback dialog for a while. Regardless, this CL makes the dialog look like the expected_report.mp4 in the bug. Tested for RTL as well.

TEST=manual
BUG=696913
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2723613005
Cr-Commit-Position: refs/heads/master@{#456147}

chrome/browser/resources/feedback/css/feedback.css

@@ -105,7 +105,6 @@ body {
 }
 
 .content #screenshot-image {
-  -webkit-margin-start: 150px;
   display: block;
   height: 60px;
   margin-top: 40px;
@@ -113,7 +112,6 @@ body {
 }
 
 .content #screenshot-image:hover {
-  -webkit-margin-start: 80px;
   height: 125px;
   margin-top: 80px;
   z-index: 1;
@@ -129,6 +127,10 @@ body {
   width: 200px;
 }
 
+.content #screenshot-label {
+  flex: auto;
+}
+
 .content #privacy-note {
   color: #969696;
   font-size: 10px;