[FIX] hr_timesheet: fix uom of allocated time field in project task view

Issue:
1) Install the timesheet module.
2) Update the encoding method in the timesheet settings to use 'days' instead.
3) Navigate to the project task section and observe that the allocated days
field incorrectly displays the unit of measure as hours instead of days.

Cause:
The planned_hours field in the project task form view contains a float_time
widget that does not convert the UOM when switching to the Days encoding method.

Fix:
Using the timesheet_uom_no_toggle widget resolves the issue by changing the
updated value. To minimize the extra space generated by using the
timesheet_uom_no_toggle widget, the o_field_float_time class is employed.

task-3318851

closes odoo/odoo#126211

X-original-commit: 93d6f475d4cca35e4d4c41e9dedce3001d50f72d
Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>

addons/hr_timesheet/views/project_task_views.xml

@@ -19,7 +19,7 @@
                     <field name="subtask_count" invisible="1"/>
                     <label for="planned_hours" attrs="{'invisible': [('allow_timesheets', '=', False)]}"/>
                     <div class="text-nowrap" attrs="{'invisible': [('allow_timesheets', '=', False)]}">
-                        <field name="planned_hours" class="oe_inline" widget="float_time"/>
+                        <field name="planned_hours" class="oe_inline o_field_float_time" widget="timesheet_uom_no_toggle"/>
                         <span attrs="{'invisible': [('subtask_count', '=', 0)]}">
                             (incl. <field name="subtask_planned_hours" nolabel="1" widget="timesheet_uom_no_toggle" class="oe_inline"/> on
                             <span class="fw-bold text-dark"> Sub-tasks</span>)