[TabLayout] Width of first tab is incorrect on some devices

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**Description:** A `TabLayout` which has a `tabMode` value of `fixed` and a `tabGravity` value of `fill` (as in the layout file [here](https://github.com/adil-hussain-84/TabLayoutExperiments/blob/master/app1/src/main/res/layout/activity_main.xml)) results in the first tab rendering with a width of `264dp` on some devices rather than its natural width, as [this](https://github.com/adil-hussain-84/TabLayoutExperiments/blob/master/app1/screenshots/TabLayoutBugScreenshot.png) screenshot demonstrates.

**Expected behavior:** The first tab should have a natural width like the other two tabs in the `TabLayout` rather than a width of `264dp` (which, curiously, is the value of the `design_tab_max_width` dimension in the `com.google.android.material:material` library).

**Source code:** See [this](https://github.com/adil-hussain-84/TabLayoutExperiments/tree/master/app1) minimal Android application which demonstrates the problem.

**Android API version:** Android 10

**Material Library version:** 1.2.1

**Device:** Moto G8 Plus landscape orientation

Start with the linked minimal Android application and reproduce the TabLayout behavior on Android 10 in landscape with fixed tabMode and fill tabGravity. Then trace the material library's TabLayout implementation and compare the first tab's width with the expected natural widths; done means the supplied reproduction no longer gives the first tab a 264dp width.

Written by the indexing model from the issue text.