removed an extra output

Gruntfile.js

@@ -40,9 +40,9 @@ module.exports = function (grunt) {
             sha = execSync('git rev-parse --short HEAD').toString('utf8').trim();
         } catch (e) {
             grunt.warn(
-                `Cannot get commit sha from git (${e.message}). It's recommended to build KeeWeb from a git repo ` +
+                "Cannot get commit sha from git. It's recommended to build KeeWeb from a git repo " +
                     'because commit sha is displayed in the UI, however if you would like to build from a folder, ' +
-                    'you can override what will be displayed in the UI with --commit-sha=xxx'
+                    'you can override what will be displayed in the UI with --commit-sha=xxx.'
             );
         }
     }