[FIX] survey: improve bar chart visuals

This commit makes sure that graph result starts at 0 in survey
results. Before the commit it would start at the lowest number of
answers, which was not the best way to visualize survey result data.

task-3389003

closes odoo/odoo#129488

X-original-commit: 8bde5f102bdbdf923c5c4d4cdd63bfdaadd7bf2b
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/survey/static/src/js/survey_result.js

@@ -153,6 +153,7 @@ publicWidget.registry.SurveyResultChart = publicWidget.Widget.extend({
                     }],
                     yAxes: [{
                         ticks: {
+                            beginAtZero: true,
                             precision: 0,
                         },
                     }],
@@ -203,7 +204,8 @@ publicWidget.registry.SurveyResultChart = publicWidget.Widget.extend({
                     }],
                     yAxes: [{
                         ticks: {
-                                precision: 0,
+                            beginAtZero: true,
+                            precision: 0,
                         },
                     }],
                 },
@@ -341,6 +343,7 @@ publicWidget.registry.SurveyResultChart = publicWidget.Widget.extend({
                             display: false,
                         },
                         ticks: {
+                            beginAtZero: true,
                             precision: 0,
                             callback: function (label) {
                                 return label + '%';
@@ -348,7 +351,7 @@ publicWidget.registry.SurveyResultChart = publicWidget.Widget.extend({
                             suggestedMin: 0,
                             suggestedMax: 100,
                             maxTicksLimit: 5,
-                            stepSize: 25
+                            stepSize: 25,
                         },
                     }],
                 },